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owntone-server/src/transcode.c
ejurgensen b6ad73e1fa [xcode] Go back to wav as default format for RSP/DAAP transcoding 
But add "prefer_format" config option for mp3, incl. a check for an encoder.
The config option is currently not added to owntone.conf.in, so is undocumented
until decided what to do about possible alac support.
2024-01-01 23:22:30 +01:00

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/*
* Copyright (C) 2015-17 Espen Jurgensen
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <libavutil/opt.h>
#include <libavutil/time.h>
#include <libavutil/pixdesc.h>
#include <libavutil/channel_layout.h>
#include <libavutil/mathematics.h>
#include "logger.h"
#include "conffile.h"
#include "db.h"
#include "misc.h"
#include "transcode.h"
// Switches for compability with ffmpeg's ever changing API
#define USE_IMAGE2PIPE (LIBAVFORMAT_VERSION_MAJOR > 58) || ((LIBAVFORMAT_VERSION_MAJOR == 58) && (LIBAVFORMAT_VERSION_MINOR > 29))
#define USE_CONST_AVFORMAT (LIBAVFORMAT_VERSION_MAJOR > 59) || ((LIBAVFORMAT_VERSION_MAJOR == 59) && (LIBAVFORMAT_VERSION_MINOR > 15))
#define USE_CONST_AVCODEC (LIBAVFORMAT_VERSION_MAJOR > 59) || ((LIBAVFORMAT_VERSION_MAJOR == 59) && (LIBAVFORMAT_VERSION_MINOR > 15))
#define USE_NO_CLEAR_AVFMT_NOFILE (LIBAVFORMAT_VERSION_MAJOR > 59) || ((LIBAVFORMAT_VERSION_MAJOR == 59) && (LIBAVFORMAT_VERSION_MINOR > 15))
#define USE_CH_LAYOUT (LIBAVCODEC_VERSION_MAJOR > 59) || ((LIBAVCODEC_VERSION_MAJOR == 59) && (LIBAVCODEC_VERSION_MINOR > 24))
// Interval between ICY metadata checks for streams, in seconds
#define METADATA_ICY_INTERVAL 5
// Maximum number of streams in a file that we will accept
#define MAX_STREAMS 64
// Maximum number of times we retry when we encounter bad packets
#define MAX_BAD_PACKETS 5
// How long to wait (in microsec) before interrupting av_read_frame
#define READ_TIMEOUT 30000000
// Buffer size for reading/writing input and output evbuffers
#define AVIO_BUFFER_SIZE 4096
// Size of the wav header that iTunes needs
#define WAV_HEADER_LEN 44
// Max filters in a filtergraph
#define MAX_FILTERS 9
static const char *default_codecs = "mpeg,wav";
static const char *roku_codecs = "mpeg,mp4a,wma,alac,wav";
static const char *itunes_codecs = "mpeg,mp4a,mp4v,alac,wav";
// Used for passing errors to DPRINTF (can't count on av_err2str being present)
static char errbuf[64];
// The settings struct will be filled out based on the profile enum
struct settings_ctx
{
bool encode_video;
bool encode_audio;
// Silence some log messages
bool silent;
// Output format (for the muxer)
const char *format;
// Input format (for the demuxer)
const char *in_format;
// Audio settings
enum AVCodecID audio_codec;
int sample_rate;
#if USE_CH_LAYOUT
AVChannelLayout channel_layout;
#else
uint64_t channel_layout;
int channels;
#endif
int bit_rate;
int frame_size;
enum AVSampleFormat sample_format;
bool with_wav_header;
bool with_icy;
bool with_user_filters;
// Video settings
enum AVCodecID video_codec;
const char *video_codec_name;
enum AVPixelFormat pix_fmt;
int height;
int width;
};
struct stream_ctx
{
AVStream *stream;
AVCodecContext *codec;
AVFilterContext *buffersink_ctx;
AVFilterContext *buffersrc_ctx;
AVFilterGraph *filter_graph;
// Used for seeking
int64_t prev_pts;
int64_t offset_pts;
};
struct decode_ctx
{
// Settings derived from the profile
struct settings_ctx settings;
// Input format context
AVFormatContext *ifmt_ctx;
// IO Context for non-file input
AVIOContext *avio;
// Stream and decoder data
struct stream_ctx audio_stream;
struct stream_ctx video_stream;
// Source duration in ms as provided by caller
uint32_t len_ms;
// Data kind (used to determine if ICY metadata is relevant to look for)
enum data_kind data_kind;
// Set to true if we just seeked
bool resume;
// Set to true if we have reached eof
bool eof;
// Set to true if avcodec_receive_frame() gave us a frame
bool got_frame;
// Contains the most recent packet from av_read_frame()
AVPacket *packet;
// Contains the most recent frame from avcodec_receive_frame()
AVFrame *decoded_frame;
// Used to measure if av_read_frame is taking too long
int64_t timestamp;
};
struct encode_ctx
{
// Settings derived from the profile
struct settings_ctx settings;
// Output format context
AVFormatContext *ofmt_ctx;
// Stream, filter and decoder data
struct stream_ctx audio_stream;
struct stream_ctx video_stream;
// The ffmpeg muxer writes to this buffer using the avio_evbuffer interface
struct evbuffer *obuf;
// Contains the most recent packet from av_buffersink_get_frame()
AVFrame *filt_frame;
// Contains the most recent packet from avcodec_receive_packet()
AVPacket *encoded_pkt;
// How many output bytes we have processed in total
off_t bytes_processed;
// Estimated total size of output
off_t bytes_total;
// Used to check for ICY metadata changes at certain intervals
uint32_t icy_interval;
uint32_t icy_hash;
// WAV header
uint8_t wav_header[WAV_HEADER_LEN];
};
enum probe_type
{
PROBE_TYPE_DEFAULT,
PROBE_TYPE_QUICK,
};
struct avio_evbuffer {
struct evbuffer *evbuf;
uint8_t *buffer;
transcode_seekfn seekfn;
void *seekfn_arg;
};
struct filter_def
{
char name[64];
char args[512];
};
struct filters
{
AVFilterContext *av_ctx;
// Function that will create the filter arguments for ffmpeg
int (*deffn)(struct filter_def *, struct stream_ctx *, struct stream_ctx *, const char *);
const char *deffn_arg;
};
/* -------------------------- PROFILE CONFIGURATION ------------------------ */
static int
init_settings(struct settings_ctx *settings, enum transcode_profile profile, struct media_quality *quality)
{
memset(settings, 0, sizeof(struct settings_ctx));
switch (profile)
{
case XCODE_PCM_NATIVE: // Sample rate and bit depth determined by source
settings->encode_audio = true;
settings->with_icy = true;
settings->with_user_filters = true;
break;
case XCODE_WAV:
settings->with_wav_header = true;
settings->with_user_filters = true;
case XCODE_PCM16:
settings->encode_audio = true;
settings->format = "s16le";
settings->audio_codec = AV_CODEC_ID_PCM_S16LE;
settings->sample_format = AV_SAMPLE_FMT_S16;
break;
case XCODE_PCM24:
settings->encode_audio = true;
settings->format = "s24le";
settings->audio_codec = AV_CODEC_ID_PCM_S24LE;
settings->sample_format = AV_SAMPLE_FMT_S32;
break;
case XCODE_PCM32:
settings->encode_audio = true;
settings->format = "s32le";
settings->audio_codec = AV_CODEC_ID_PCM_S32LE;
settings->sample_format = AV_SAMPLE_FMT_S32;
break;
case XCODE_MP3:
settings->encode_audio = true;
settings->format = "mp3";
settings->audio_codec = AV_CODEC_ID_MP3;
settings->sample_format = AV_SAMPLE_FMT_S16P;
break;
case XCODE_OPUS:
settings->encode_audio = true;
settings->format = "data"; // Means we get the raw packet from the encoder, no muxing
settings->audio_codec = AV_CODEC_ID_OPUS;
settings->sample_format = AV_SAMPLE_FMT_S16; // Only libopus support
break;
case XCODE_ALAC:
settings->encode_audio = true;
settings->format = "data"; // Means we get the raw packet from the encoder, no muxing
settings->audio_codec = AV_CODEC_ID_ALAC;
settings->sample_format = AV_SAMPLE_FMT_S16P;
settings->frame_size = 352;
break;
case XCODE_OGG:
settings->encode_audio = true;
settings->in_format = "ogg";
break;
case XCODE_JPEG:
settings->encode_video = true;
settings->silent = 1;
// With ffmpeg 4.3 (> libavformet 58.29) "image2" only works for actual file
// output. It's possible we should have used "image2pipe" all along, but since
// "image2" has been working we only replace it going forward.
#if USE_IMAGE2PIPE
settings->format = "image2pipe";
#else
settings->format = "image2";
#endif
settings->in_format = "mjpeg";
settings->pix_fmt = AV_PIX_FMT_YUVJ420P;
settings->video_codec = AV_CODEC_ID_MJPEG;
break;
case XCODE_PNG:
settings->encode_video = true;
settings->silent = true;
// See explanation above
#if USE_IMAGE2PIPE
settings->format = "image2pipe";
#else
settings->format = "image2";
#endif
settings->pix_fmt = AV_PIX_FMT_RGB24;
settings->video_codec = AV_CODEC_ID_PNG;
break;
case XCODE_VP8:
settings->encode_video = true;
settings->silent = true;
// See explanation above
#if USE_IMAGE2PIPE
settings->format = "image2pipe";
#else
settings->format = "image2";
#endif
settings->pix_fmt = AV_PIX_FMT_YUVJ420P;
settings->video_codec = AV_CODEC_ID_VP8;
break;
default:
DPRINTF(E_LOG, L_XCODE, "Bug! Unknown transcoding profile\n");
return -1;
}
if (quality && quality->sample_rate)
{
settings->sample_rate = quality->sample_rate;
}
if (quality && quality->channels)
{
#if USE_CH_LAYOUT
av_channel_layout_default(&settings->channel_layout, quality->channels);
#else
settings->channel_layout = av_get_default_channel_layout(quality->channels);
settings->channels = quality->channels;
#endif
}
if (quality && quality->bit_rate)
{
settings->bit_rate = quality->bit_rate;
}
if (quality && quality->bits_per_sample && (quality->bits_per_sample != 8 * av_get_bytes_per_sample(settings->sample_format)))
{
DPRINTF(E_LOG, L_XCODE, "Bug! Mismatch between profile (%d bps) and media quality (%d bps)\n", 8 * av_get_bytes_per_sample(settings->sample_format), quality->bits_per_sample);
return -1;
}
return 0;
}
static void
stream_settings_set(struct stream_ctx *s, struct settings_ctx *settings, enum AVMediaType type)
{
if (type == AVMEDIA_TYPE_AUDIO)
{
s->codec->sample_rate = settings->sample_rate;
#if USE_CH_LAYOUT
av_channel_layout_copy(&s->codec->ch_layout, &(settings->channel_layout));
#else
s->codec->channel_layout = settings->channel_layout;
s->codec->channels = settings->channels;
#endif
s->codec->sample_fmt = settings->sample_format;
s->codec->time_base = (AVRational){1, settings->sample_rate};
s->codec->bit_rate = settings->bit_rate;
}
else if (type == AVMEDIA_TYPE_VIDEO)
{
s->codec->height = settings->height;
s->codec->width = settings->width;
s->codec->pix_fmt = settings->pix_fmt;
s->codec->time_base = (AVRational){1, 25};
}
}
/* -------------------------------- HELPERS -------------------------------- */
static enum AVSampleFormat
bitdepth2format(int bits_per_sample)
{
if (bits_per_sample == 16)
return AV_SAMPLE_FMT_S16;
else if (bits_per_sample == 24)
return AV_SAMPLE_FMT_S32;
else if (bits_per_sample == 32)
return AV_SAMPLE_FMT_S32;
else
return AV_SAMPLE_FMT_NONE;
}
static inline char *
err2str(int errnum)
{
av_strerror(errnum, errbuf, sizeof(errbuf));
return errbuf;
}
static inline void
add_le16(uint8_t *dst, uint16_t val)
{
dst[0] = val & 0xff;
dst[1] = (val >> 8) & 0xff;
}
static inline void
add_le32(uint8_t *dst, uint32_t val)
{
dst[0] = val & 0xff;
dst[1] = (val >> 8) & 0xff;
dst[2] = (val >> 16) & 0xff;
dst[3] = (val >> 24) & 0xff;
}
/*
* header must have size WAV_HEADER_LEN (44 bytes)
*/
static void
make_wav_header(uint8_t *header, int sample_rate, int bytes_per_sample, int channels, off_t bytes_total)
{
uint32_t wav_size = bytes_total - WAV_HEADER_LEN;
memcpy(header, "RIFF", 4);
add_le32(header + 4, 36 + wav_size);
memcpy(header + 8, "WAVEfmt ", 8);
add_le32(header + 16, 16);
add_le16(header + 20, 1);
add_le16(header + 22, channels); /* channels */
add_le32(header + 24, sample_rate); /* samplerate */
add_le32(header + 28, sample_rate * channels * bytes_per_sample); /* byte rate */
add_le16(header + 32, channels * bytes_per_sample); /* block align */
add_le16(header + 34, 8 * bytes_per_sample); /* bits per sample */
memcpy(header + 36, "data", 4);
add_le32(header + 40, wav_size);
}
static off_t
size_estimate(enum transcode_profile profile, int bit_rate, int sample_rate, int bytes_per_sample, int channels, int len_ms)
{
off_t bytes;
// If the source has a number of samples that doesn't match an even len_ms
// then the length may have been rounded up. We prefer an estimate that is on
// the low side, otherwise ffprobe won't trust the length from our wav header.
if (len_ms > 0)
len_ms -= 1;
else
len_ms = 3 * 60 * 1000;
if (profile == XCODE_WAV)
bytes = (int64_t)len_ms * channels * bytes_per_sample * sample_rate / 1000 + WAV_HEADER_LEN;
else if (profile == XCODE_MP3)
bytes = (int64_t)len_ms * bit_rate / 8000;
else
bytes = -1;
return bytes;
}
/*
* Checks if this stream index is one that we are decoding
*
* @in ctx Decode context
* @in stream_index Index of stream to check
* @return Type of stream, unknown if we are not decoding the stream
*/
static enum AVMediaType
stream_find(struct decode_ctx *ctx, unsigned int stream_index)
{
if (ctx->audio_stream.stream && (stream_index == ctx->audio_stream.stream->index))
return AVMEDIA_TYPE_AUDIO;
if (ctx->video_stream.stream && (stream_index == ctx->video_stream.stream->index))
return AVMEDIA_TYPE_VIDEO;
return AVMEDIA_TYPE_UNKNOWN;
}
/*
* Adds a stream to an output
*
* @out ctx A pre-allocated stream ctx where we save stream and codec info
* @in output Output to add the stream to
* @in codec_id What kind of codec should we use
* @return Negative on failure, otherwise zero
*/
static int
stream_add(struct encode_ctx *ctx, struct stream_ctx *s, enum AVCodecID codec_id)
{
const AVCodecDescriptor *codec_desc;
#if USE_CONST_AVCODEC
const AVCodec *encoder;
#else
// Not const before ffmpeg 5.0
AVCodec *encoder;
#endif
AVDictionary *options = NULL;
int ret;
codec_desc = avcodec_descriptor_get(codec_id);
if (!codec_desc)
{
DPRINTF(E_LOG, L_XCODE, "Invalid codec ID (%d)\n", codec_id);
return -1;
}
encoder = avcodec_find_encoder(codec_id);
if (!encoder)
{
DPRINTF(E_LOG, L_XCODE, "Necessary encoder (%s) not found\n", codec_desc->name);
return -1;
}
DPRINTF(E_DBG, L_XCODE, "Selected encoder '%s'\n", encoder->long_name);
CHECK_NULL(L_XCODE, s->stream = avformat_new_stream(ctx->ofmt_ctx, NULL));
CHECK_NULL(L_XCODE, s->codec = avcodec_alloc_context3(encoder));
stream_settings_set(s, &ctx->settings, encoder->type);
if (!s->codec->pix_fmt)
{
s->codec->pix_fmt = avcodec_default_get_format(s->codec, encoder->pix_fmts);
DPRINTF(E_DBG, L_XCODE, "Pixel format set to %s (encoder is %s)\n", av_get_pix_fmt_name(s->codec->pix_fmt), codec_desc->name);
}
if (ctx->ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
s->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
// With ffmpeg 3.4, jpeg encoding with optimal huffman tables will segfault, see issue #502
if (codec_id == AV_CODEC_ID_MJPEG)
av_dict_set(&options, "huffman", "default", 0);
// 20 ms frames is the current ffmpeg default, but we set it anyway, so that
// we don't risk issues if future versions change the default (it would become
// an issue because outputs/cast.c relies on 20 ms frames)
if (codec_id == AV_CODEC_ID_OPUS)
av_dict_set(&options, "frame_duration", "20", 0);
ret = avcodec_open2(s->codec, NULL, &options);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Cannot open encoder (%s): %s\n", codec_desc->name, err2str(ret));
goto error;
}
// airplay.c "misuses" the ffmpeg alac encoder in that it pushes frames with
// 352 samples even though the encoder wants 4096 (and doesn't have variable
// frame capability). This worked with no issues until ffmpeg 6, where it
// seems a frame size check was added. The below circumvents the check, but is
// dirty because we shouldn't be writing to this data element.
if (ctx->settings.frame_size)
s->codec->frame_size = ctx->settings.frame_size;
// Copy the codec parameters we just set to the stream, so the muxer knows them
ret = avcodec_parameters_from_context(s->stream->codecpar, s->codec);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Cannot copy stream parameters (%s): %s\n", codec_desc->name, err2str(ret));
goto error;
}
if (options)
{
DPRINTF(E_WARN, L_XCODE, "Encoder %s didn't recognize all options given to avcodec_open2\n", codec_desc->name);
av_dict_free(&options);
}
return 0;
error:
if (s->codec)
avcodec_free_context(&s->codec);
if (options)
av_dict_free(&options);
return -1;
}
/*
* Called by libavformat while demuxing. Used to interrupt/unblock av_read_frame
* in case a source (especially a network stream) becomes unavailable.
*
* @in arg Will point to the decode context
* @return Non-zero if av_read_frame should be interrupted
*/
static int
decode_interrupt_cb(void *arg)
{
struct decode_ctx *ctx;
ctx = (struct decode_ctx *)arg;
if (av_gettime() - ctx->timestamp > READ_TIMEOUT)
{
DPRINTF(E_LOG, L_XCODE, "Timeout while reading source (connection problem?)\n");
return 1;
}
return 0;
}
/* Will read the next packet from the source, unless we are resuming after a
* seek in which case the most recent packet found by transcode_seek() will be
* returned. The packet will be put in ctx->packet.
*
* @out type Media type of packet
* @in ctx Decode context
* @return 0 if OK, < 0 on error or end of file
*/
static int
read_packet(enum AVMediaType *type, struct decode_ctx *dec_ctx)
{
int ret;
// We just seeked, so transcode_seek() will have found a new ctx->packet and
// we should just use start with that (if the stream is one are ok with)
if (dec_ctx->resume)
{
dec_ctx->resume = 0;
*type = stream_find(dec_ctx, dec_ctx->packet->stream_index);
if (*type != AVMEDIA_TYPE_UNKNOWN)
return 0;
}
do
{
dec_ctx->timestamp = av_gettime();
av_packet_unref(dec_ctx->packet);
ret = av_read_frame(dec_ctx->ifmt_ctx, dec_ctx->packet);
if (ret < 0)
{
DPRINTF(E_WARN, L_XCODE, "Could not read frame: %s\n", err2str(ret));
return ret;
}
*type = stream_find(dec_ctx, dec_ctx->packet->stream_index);
}
while (*type == AVMEDIA_TYPE_UNKNOWN);
return 0;
}
// Prepares a packet from the encoder for muxing
static void
packet_prepare(AVPacket *pkt, struct stream_ctx *s)
{
pkt->stream_index = s->stream->index;
// This "wonderful" peace of code makes sure that the timestamp always increases,
// even if the user seeked backwards. The muxer will not accept non-increasing
// timestamps.
pkt->pts += s->offset_pts;
if (pkt->pts < s->prev_pts)
{
s->offset_pts += s->prev_pts - pkt->pts;
pkt->pts = s->prev_pts;
}
s->prev_pts = pkt->pts;
pkt->dts = pkt->pts; //FIXME
av_packet_rescale_ts(pkt, s->codec->time_base, s->stream->time_base);
}
/*
* Part 4+5 of the conversion chain: read -> decode -> filter -> encode -> write
*
*/
static int
encode_write(struct encode_ctx *ctx, struct stream_ctx *s, AVFrame *filt_frame)
{
int ret;
// If filt_frame is null then flushing will be initiated by the codec
ret = avcodec_send_frame(s->codec, filt_frame);
if (ret < 0)
return ret;
while (1)
{
ret = avcodec_receive_packet(s->codec, ctx->encoded_pkt);
if (ret < 0)
{
if (ret == AVERROR(EAGAIN))
ret = 0;
break;
}
packet_prepare(ctx->encoded_pkt, s);
ret = av_interleaved_write_frame(ctx->ofmt_ctx, ctx->encoded_pkt);
if (ret < 0)
{
DPRINTF(E_WARN, L_XCODE, "av_interleaved_write_frame() failed: %s\n", err2str(ret));
break;
}
}
return ret;
}
/*
* Part 3 of the conversion chain: read -> decode -> filter -> encode -> write
*
* transcode_encode() starts here since the caller already has a frame
*
*/
static int
filter_encode_write(struct encode_ctx *ctx, struct stream_ctx *s, AVFrame *frame)
{
int ret;
// Push the decoded frame into the filtergraph
if (frame)
{
ret = av_buffersrc_add_frame(s->buffersrc_ctx, frame);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error while feeding the filtergraph: %s\n", err2str(ret));
return -1;
}
}
// Pull filtered frames from the filtergraph and pass to encoder
while (1)
{
ret = av_buffersink_get_frame(s->buffersink_ctx, ctx->filt_frame);
if (ret < 0)
{
if (!frame) // We are flushing
ret = encode_write(ctx, s, NULL);
else if (ret == AVERROR(EAGAIN))
ret = 0;
break;
}
ret = encode_write(ctx, s, ctx->filt_frame);
av_frame_unref(ctx->filt_frame);
if (ret < 0)
break;
}
return ret;
}
/*
* Part 2 of the conversion chain: read -> decode -> filter -> encode -> write
*
* If there is no encode_ctx the chain will aborted here
*
*/
static int
decode_filter_encode_write(struct transcode_ctx *ctx, struct stream_ctx *s, AVPacket *pkt, enum AVMediaType type)
{
struct decode_ctx *dec_ctx = ctx->decode_ctx;
struct stream_ctx *out_stream = NULL;
int ret;
ret = avcodec_send_packet(s->codec, pkt);
if (ret < 0 && (ret != AVERROR_INVALIDDATA) && (ret != AVERROR(EAGAIN))) // We don't bail on invalid data, some streams work anyway
{
DPRINTF(E_LOG, L_XCODE, "Decoder error, avcodec_send_packet said '%s' (%d)\n", err2str(ret), ret);
return ret;
}
if (ctx->encode_ctx)
{
if (type == AVMEDIA_TYPE_AUDIO)
out_stream = &ctx->encode_ctx->audio_stream;
else if (type == AVMEDIA_TYPE_VIDEO)
out_stream = &ctx->encode_ctx->video_stream;
else
return -1;
}
while (1)
{
ret = avcodec_receive_frame(s->codec, dec_ctx->decoded_frame);
if (ret < 0)
{
if (ret == AVERROR(EAGAIN))
ret = 0;
else if (out_stream)
ret = filter_encode_write(ctx->encode_ctx, out_stream, NULL); // Flush
break;
}
dec_ctx->got_frame = 1;
if (!out_stream)
break;
ret = filter_encode_write(ctx->encode_ctx, out_stream, dec_ctx->decoded_frame);
if (ret < 0)
break;
}
return ret;
}
/*
* Part 1 of the conversion chain: read -> decode -> filter -> encode -> write
*
* Will read exactly one packet from the input and put it in the chain. You
* cannot count on anything coming out of the other end from just one packet,
* so you probably should loop when calling this and check the contents of
* enc_ctx->obuf.
*
*/
static int
read_decode_filter_encode_write(struct transcode_ctx *ctx)
{
struct decode_ctx *dec_ctx = ctx->decode_ctx;
enum AVMediaType type;
int ret;
ret = read_packet(&type, dec_ctx);
if (ret < 0)
{
if (ret == AVERROR_EOF)
dec_ctx->eof = 1;
if (dec_ctx->audio_stream.stream)
decode_filter_encode_write(ctx, &dec_ctx->audio_stream, NULL, AVMEDIA_TYPE_AUDIO);
if (dec_ctx->video_stream.stream)
decode_filter_encode_write(ctx, &dec_ctx->video_stream, NULL, AVMEDIA_TYPE_VIDEO);
// Flush muxer
if (ctx->encode_ctx)
{
av_interleaved_write_frame(ctx->encode_ctx->ofmt_ctx, NULL);
av_write_trailer(ctx->encode_ctx->ofmt_ctx);
}
return ret;
}
if (type == AVMEDIA_TYPE_AUDIO)
ret = decode_filter_encode_write(ctx, &dec_ctx->audio_stream, dec_ctx->packet, type);
else if (type == AVMEDIA_TYPE_VIDEO)
ret = decode_filter_encode_write(ctx, &dec_ctx->video_stream, dec_ctx->packet, type);
return ret;
}
/* ------------------------------- CUSTOM I/O ------------------------------ */
/* For using ffmpeg with evbuffer input/output instead of files */
static int
avio_evbuffer_read(void *opaque, uint8_t *buf, int size)
{
struct avio_evbuffer *ae = (struct avio_evbuffer *)opaque;
int ret;
ret = evbuffer_remove(ae->evbuf, buf, size);
// Must return AVERROR, see avio.h: avio_alloc_context()
return (ret > 0) ? ret : AVERROR_EOF;
}
static int
avio_evbuffer_write(void *opaque, uint8_t *buf, int size)
{
struct avio_evbuffer *ae = (struct avio_evbuffer *)opaque;
int ret;
ret = evbuffer_add(ae->evbuf, buf, size);
return (ret == 0) ? size : -1;
}
static int64_t
avio_evbuffer_seek(void *opaque, int64_t offset, int whence)
{
struct avio_evbuffer *ae = (struct avio_evbuffer *)opaque;
enum transcode_seek_type seek_type;
// Caller shouldn't need to know about ffmpeg defines
if (whence & AVSEEK_SIZE)
seek_type = XCODE_SEEK_SIZE;
else if (whence == SEEK_SET)
seek_type = XCODE_SEEK_SET;
else if (whence == SEEK_CUR)
seek_type = XCODE_SEEK_CUR;
else
return -1;
return ae->seekfn(ae->seekfn_arg, offset, seek_type);
}
static AVIOContext *
avio_evbuffer_open(struct transcode_evbuf_io *evbuf_io, int is_output)
{
struct avio_evbuffer *ae;
AVIOContext *s;
ae = calloc(1, sizeof(struct avio_evbuffer));
if (!ae)
{
DPRINTF(E_LOG, L_FFMPEG, "Out of memory for avio_evbuffer\n");
return NULL;
}
ae->buffer = av_mallocz(AVIO_BUFFER_SIZE);
if (!ae->buffer)
{
DPRINTF(E_LOG, L_FFMPEG, "Out of memory for avio buffer\n");
free(ae);
return NULL;
}
ae->evbuf = evbuf_io->evbuf;
ae->seekfn = evbuf_io->seekfn;
ae->seekfn_arg = evbuf_io->seekfn_arg;
if (is_output)
s = avio_alloc_context(ae->buffer, AVIO_BUFFER_SIZE, 1, ae, NULL, avio_evbuffer_write, NULL);
else
s = avio_alloc_context(ae->buffer, AVIO_BUFFER_SIZE, 0, ae, avio_evbuffer_read, NULL, (evbuf_io->seekfn ? avio_evbuffer_seek : NULL));
if (!s)
{
DPRINTF(E_LOG, L_FFMPEG, "Could not allocate AVIOContext\n");
av_free(ae->buffer);
free(ae);
return NULL;
}
s->seekable = (evbuf_io->seekfn ? AVIO_SEEKABLE_NORMAL : 0);
return s;
}
static AVIOContext *
avio_input_evbuffer_open(struct transcode_evbuf_io *evbuf_io)
{
return avio_evbuffer_open(evbuf_io, 0);
}
static AVIOContext *
avio_output_evbuffer_open(struct evbuffer *evbuf)
{
struct transcode_evbuf_io evbuf_io = { 0 };
evbuf_io.evbuf = evbuf;
return avio_evbuffer_open(&evbuf_io, 1);
}
static void
avio_evbuffer_close(AVIOContext *s)
{
struct avio_evbuffer *ae;
if (!s)
return;
ae = (struct avio_evbuffer *)s->opaque;
avio_flush(s);
av_free(s->buffer);
free(ae);
av_free(s);
}
/* --------------------------- INPUT/OUTPUT INIT --------------------------- */
static int
open_decoder(AVCodecContext **dec_ctx, unsigned int *stream_index, struct decode_ctx *ctx, enum AVMediaType type)
{
#if USE_CONST_AVCODEC
const AVCodec *decoder;
#else
// Not const before ffmpeg 5.0
AVCodec *decoder;
#endif
int ret;
ret = av_find_best_stream(ctx->ifmt_ctx, type, -1, -1, &decoder, 0);
if (ret < 0)
{
if (!ctx->settings.silent)
DPRINTF(E_LOG, L_XCODE, "Error finding best stream: %s\n", err2str(ret));
return ret;
}
*stream_index = (unsigned int)ret;
CHECK_NULL(L_XCODE, *dec_ctx = avcodec_alloc_context3(decoder));
// Filter creation will need the sample rate and format that the decoder is
// giving us - however sample rate of dec_ctx will be 0 if we don't prime it
// with the streams codecpar data.
ret = avcodec_parameters_to_context(*dec_ctx, ctx->ifmt_ctx->streams[*stream_index]->codecpar);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Failed to copy codecpar for stream #%d: %s\n", *stream_index, err2str(ret));
avcodec_free_context(dec_ctx);
return ret;
}
ret = avcodec_open2(*dec_ctx, NULL, NULL);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Failed to open decoder for stream #%d: %s\n", *stream_index, err2str(ret));
avcodec_free_context(dec_ctx);
return ret;
}
return 0;
}
static int
open_input(struct decode_ctx *ctx, const char *path, struct transcode_evbuf_io *evbuf_io, enum probe_type probe_type)
{
AVDictionary *options = NULL;
AVCodecContext *dec_ctx;
#if USE_CONST_AVFORMAT
const AVInputFormat *ifmt;
#else
// Not const before ffmpeg 5.0
AVInputFormat *ifmt;
#endif
unsigned int stream_index;
const char *user_agent;
int ret = 0;
CHECK_NULL(L_XCODE, ctx->ifmt_ctx = avformat_alloc_context());
// Caller can ask for small probe to start quicker + search for embedded
// artwork quicker. Especially useful for http sources. The standard probe
// size takes around 5 sec for an mp3, while the below only takes around a
// second. The improved performance comes at the cost of possible inaccuracy.
if (probe_type == PROBE_TYPE_QUICK)
{
ctx->ifmt_ctx->probesize = 65536;
ctx->ifmt_ctx->format_probesize = 65536;
}
if (ctx->data_kind == DATA_KIND_HTTP)
{
av_dict_set(&options, "icy", "1", 0);
user_agent = cfg_getstr(cfg_getsec(cfg, "general"), "user_agent");
av_dict_set(&options, "user_agent", user_agent, 0);
av_dict_set(&options, "reconnect", "1", 0);
// The below option disabled because it does not work with m3u8 streams,
// see https://lists.ffmpeg.org/pipermail/ffmpeg-user/2018-September/041109.html
// av_dict_set(&options, "reconnect_at_eof", "1", 0);
av_dict_set(&options, "reconnect_streamed", "1", 0);
}
// TODO Newest versions of ffmpeg have timeout and reconnect options we should use
ctx->ifmt_ctx->interrupt_callback.callback = decode_interrupt_cb;
ctx->ifmt_ctx->interrupt_callback.opaque = ctx;
ctx->timestamp = av_gettime();
if (evbuf_io)
{
ifmt = av_find_input_format(ctx->settings.in_format);
if (!ifmt)
{
DPRINTF(E_LOG, L_XCODE, "Could not find input format: '%s'\n", ctx->settings.in_format);
goto out_fail;
}
CHECK_NULL(L_XCODE, ctx->avio = avio_input_evbuffer_open(evbuf_io));
ctx->ifmt_ctx->pb = ctx->avio;
ret = avformat_open_input(&ctx->ifmt_ctx, NULL, ifmt, &options);
}
else
{
ret = avformat_open_input(&ctx->ifmt_ctx, path, NULL, &options);
}
if (options)
av_dict_free(&options);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Cannot open '%s': %s\n", path, err2str(ret));
goto out_fail;
}
// If the source has REPLAYGAIN_TRACK_GAIN metadata, this will inject the
// values into the the next packet's side data (as AV_FRAME_DATA_REPLAYGAIN),
// which has the effect that a volume replaygain filter works. Note that
// ffmpeg itself uses another method in process_input() in ffmpeg.c.
av_format_inject_global_side_data(ctx->ifmt_ctx);
ret = avformat_find_stream_info(ctx->ifmt_ctx, NULL);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Cannot find stream information: %s\n", err2str(ret));
goto out_fail;
}
if (ctx->ifmt_ctx->nb_streams > MAX_STREAMS)
{
DPRINTF(E_LOG, L_XCODE, "File '%s' has too many streams (%u)\n", path, ctx->ifmt_ctx->nb_streams);
goto out_fail;
}
if (ctx->settings.encode_audio)
{
ret = open_decoder(&dec_ctx, &stream_index, ctx, AVMEDIA_TYPE_AUDIO);
if (ret < 0)
goto out_fail;
ctx->audio_stream.codec = dec_ctx;
ctx->audio_stream.stream = ctx->ifmt_ctx->streams[stream_index];
}
if (ctx->settings.encode_video)
{
ret = open_decoder(&dec_ctx, &stream_index, ctx, AVMEDIA_TYPE_VIDEO);
if (ret < 0)
goto out_fail;
ctx->video_stream.codec = dec_ctx;
ctx->video_stream.stream = ctx->ifmt_ctx->streams[stream_index];
}
return 0;
out_fail:
avio_evbuffer_close(ctx->avio);
avcodec_free_context(&ctx->audio_stream.codec);
avcodec_free_context(&ctx->video_stream.codec);
avformat_close_input(&ctx->ifmt_ctx);
return (ret < 0 ? ret : -1); // If we got an error code from ffmpeg then return that
}
static void
close_input(struct decode_ctx *ctx)
{
avio_evbuffer_close(ctx->avio);
avcodec_free_context(&ctx->audio_stream.codec);
avcodec_free_context(&ctx->video_stream.codec);
avformat_close_input(&ctx->ifmt_ctx);
}
static int
open_output(struct encode_ctx *ctx, struct decode_ctx *src_ctx)
{
#if USE_CONST_AVFORMAT
const AVOutputFormat *oformat;
#else
// Not const before ffmpeg 5.0
AVOutputFormat *oformat;
#endif
int ret;
oformat = av_guess_format(ctx->settings.format, NULL, NULL);
if (!oformat)
{
DPRINTF(E_LOG, L_XCODE, "ffmpeg/libav could not find the '%s' output format\n", ctx->settings.format);
return -1;
}
#if USE_NO_CLEAR_AVFMT_NOFILE
CHECK_ERRNO(L_XCODE, avformat_alloc_output_context2(&ctx->ofmt_ctx, oformat, NULL, NULL));
#else
// Clear AVFMT_NOFILE bit, it is not allowed as we will set our own AVIOContext.
// If this is not done with e.g. ffmpeg 3.4 then artwork rescaling will fail.
oformat->flags &= ~AVFMT_NOFILE;
CHECK_NULL(L_XCODE, ctx->ofmt_ctx = avformat_alloc_context());
ctx->ofmt_ctx->oformat = oformat;
#endif
ctx->obuf = evbuffer_new();
if (!ctx->obuf)
{
DPRINTF(E_LOG, L_XCODE, "Could not create output evbuffer\n");
goto out_free_output;
}
ctx->ofmt_ctx->pb = avio_output_evbuffer_open(ctx->obuf);
if (!ctx->ofmt_ctx->pb)
{
DPRINTF(E_LOG, L_XCODE, "Could not create output avio pb\n");
goto out_free_evbuf;
}
if (ctx->settings.encode_audio)
{
ret = stream_add(ctx, &ctx->audio_stream, ctx->settings.audio_codec);
if (ret < 0)
goto out_free_streams;
}
if (ctx->settings.encode_video)
{
ret = stream_add(ctx, &ctx->video_stream, ctx->settings.video_codec);
if (ret < 0)
goto out_free_streams;
}
// Notice, this will not write WAV header (so we do that manually)
ret = avformat_write_header(ctx->ofmt_ctx, NULL);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error writing header to output buffer: %s\n", err2str(ret));
goto out_free_streams;
}
if (ctx->settings.with_wav_header)
{
evbuffer_add(ctx->obuf, ctx->wav_header, sizeof(ctx->wav_header));
}
return 0;
out_free_streams:
avcodec_free_context(&ctx->audio_stream.codec);
avcodec_free_context(&ctx->video_stream.codec);
avio_evbuffer_close(ctx->ofmt_ctx->pb);
out_free_evbuf:
evbuffer_free(ctx->obuf);
out_free_output:
avformat_free_context(ctx->ofmt_ctx);
return -1;
}
static void
close_output(struct encode_ctx *ctx)
{
avcodec_free_context(&ctx->audio_stream.codec);
avcodec_free_context(&ctx->video_stream.codec);
avio_evbuffer_close(ctx->ofmt_ctx->pb);
evbuffer_free(ctx->obuf);
avformat_free_context(ctx->ofmt_ctx);
}
static int
filter_def_abuffer(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
#if USE_CH_LAYOUT
char buf[64];
// Some AIFF files only have a channel number, not a layout
if (in_stream->codec->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
av_channel_layout_default(&in_stream->codec->ch_layout, in_stream->codec->ch_layout.nb_channels);
av_channel_layout_describe(&in_stream->codec->ch_layout, buf, sizeof(buf));
snprintf(def->args, sizeof(def->args),
"time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=%s",
in_stream->stream->time_base.num, in_stream->stream->time_base.den,
in_stream->codec->sample_rate, av_get_sample_fmt_name(in_stream->codec->sample_fmt),
buf);
#else
if (!in_stream->codec->channel_layout)
in_stream->codec->channel_layout = av_get_default_channel_layout(in_stream->codec->channels);
snprintf(def->args, sizeof(def->args),
"time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=0x%"PRIx64,
in_stream->stream->time_base.num, in_stream->stream->time_base.den,
in_stream->codec->sample_rate, av_get_sample_fmt_name(in_stream->codec->sample_fmt),
in_stream->codec->channel_layout);
#endif
snprintf(def->name, sizeof(def->name), "abuffer");
return 0;
}
static int
filter_def_aformat(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
#if USE_CH_LAYOUT
char buf[64];
if (out_stream->codec->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
av_channel_layout_default(&out_stream->codec->ch_layout, out_stream->codec->ch_layout.nb_channels);
av_channel_layout_describe(&out_stream->codec->ch_layout, buf, sizeof(buf));
snprintf(def->args, sizeof(def->args),
"sample_fmts=%s:sample_rates=%d:channel_layouts=%s",
av_get_sample_fmt_name(out_stream->codec->sample_fmt), out_stream->codec->sample_rate,
buf);
#else
// For some AIFF files, ffmpeg (3.4.6) will not give us a channel_layout (bug in ffmpeg?)
if (!out_stream->codec->channel_layout)
out_stream->codec->channel_layout = av_get_default_channel_layout(out_stream->codec->channels);
snprintf(def->args, sizeof(def->args),
"sample_fmts=%s:sample_rates=%d:channel_layouts=0x%"PRIx64,
av_get_sample_fmt_name(out_stream->codec->sample_fmt), out_stream->codec->sample_rate,
out_stream->codec->channel_layout);
#endif
snprintf(def->name, sizeof(def->name), "aformat");
return 0;
}
static int
filter_def_abuffersink(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
snprintf(def->name, sizeof(def->name), "abuffersink");
*def->args = '\0';
return 0;
}
static int
filter_def_buffer(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
snprintf(def->name, sizeof(def->name), "buffer");
snprintf(def->args, sizeof(def->args),
"width=%d:height=%d:pix_fmt=%s:time_base=%d/%d:sar=%d/%d",
in_stream->codec->width, in_stream->codec->height, av_get_pix_fmt_name(in_stream->codec->pix_fmt),
in_stream->stream->time_base.num, in_stream->stream->time_base.den,
in_stream->codec->sample_aspect_ratio.num, in_stream->codec->sample_aspect_ratio.den);
return 0;
}
static int
filter_def_format(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
snprintf(def->name, sizeof(def->name), "format");
snprintf(def->args, sizeof(def->args),
"pix_fmts=%s", av_get_pix_fmt_name(out_stream->codec->pix_fmt));
return 0;
}
static int
filter_def_scale(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
snprintf(def->name, sizeof(def->name), "scale");
snprintf(def->args, sizeof(def->args),
"w=%d:h=%d", out_stream->codec->width, out_stream->codec->height);
return 0;
}
static int
filter_def_buffersink(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
snprintf(def->name, sizeof(def->name), "buffersink");
*def->args = '\0';
return 0;
}
static int
filter_def_user(struct filter_def *def, struct stream_ctx *out_stream, struct stream_ctx *in_stream, const char *deffn_arg)
{
char *ptr;
snprintf(def->name, sizeof(def->name), "%s", deffn_arg);
ptr = strchr(def->name, '=');
if (ptr)
{
*ptr = '\0';
snprintf(def->args, sizeof(def->args), "%s", ptr + 1);
}
else
*def->args = '\0';
return 0;
}
static int
define_audio_filters(struct filters *filters, size_t filters_len, bool with_user_filters)
{
int num_user_filters;
int i;
num_user_filters = cfg_size(cfg_getsec(cfg, "library"), "decode_audio_filters");
if (filters_len < num_user_filters + 3)
{
DPRINTF(E_LOG, L_XCODE, "Too many audio filters configured (%d, max is %zu)\n", num_user_filters, filters_len - 3);
return -1;
}
filters[0].deffn = filter_def_abuffer;
for (i = 0; with_user_filters && i < num_user_filters; i++)
{
filters[1 + i].deffn = filter_def_user;
filters[1 + i].deffn_arg = cfg_getnstr(cfg_getsec(cfg, "library"), "decode_audio_filters", i);
}
filters[1 + i].deffn = filter_def_aformat;
filters[2 + i].deffn = filter_def_abuffersink;
return 0;
}
static int
define_video_filters(struct filters *filters, size_t filters_len, bool with_user_filters)
{
int num_user_filters;
int i;
num_user_filters = cfg_size(cfg_getsec(cfg, "library"), "decode_video_filters");
if (filters_len < num_user_filters + 3)
{
DPRINTF(E_LOG, L_XCODE, "Too many video filters configured (%d, max is %zu)\n", num_user_filters, filters_len - 3);
return -1;
}
filters[0].deffn = filter_def_buffer;
for (i = 0; with_user_filters && i < num_user_filters; i++)
{
filters[1 + i].deffn = filter_def_user;
filters[1 + i].deffn_arg = cfg_getnstr(cfg_getsec(cfg, "library"), "decode_video_filters", i);
}
filters[1 + i].deffn = filter_def_format;
filters[2 + i].deffn = filter_def_scale;
filters[3 + i].deffn = filter_def_buffersink;
return 0;
}
static int
add_filters(int *num_added, AVFilterGraph *filter_graph, struct filters *filters, size_t filters_len,
struct stream_ctx *out_stream, struct stream_ctx *in_stream)
{
const AVFilter *av_filter;
struct filter_def def;
int i;
int ret;
for (i = 0; i < filters_len && filters[i].deffn; i++)
{
ret = filters[i].deffn(&def, out_stream, in_stream, filters[i].deffn_arg);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error creating filter definition\n");
return -1;
}
av_filter = avfilter_get_by_name(def.name);
if (!av_filter)
{
DPRINTF(E_LOG, L_XCODE, "Could not find filter '%s'\n", def.name);
return -1;
}
ret = avfilter_graph_create_filter(&filters[i].av_ctx, av_filter, def.name, def.args, NULL, filter_graph);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error creating filter '%s': %s\n", def.name, err2str(ret));
return -1;
}
DPRINTF(E_DBG, L_XCODE, "Created '%s' filter: '%s'\n", def.name, def.args);
if (i == 0)
continue;
ret = avfilter_link(filters[i - 1].av_ctx, 0, filters[i].av_ctx, 0);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error connecting filters: %s\n", err2str(ret));
return -1;
}
}
*num_added = i;
return 0;
}
static int
create_filtergraph(struct stream_ctx *out_stream, struct filters *filters, size_t filters_len, struct stream_ctx *in_stream)
{
AVFilterGraph *filter_graph;
int ret;
int added;
CHECK_NULL(L_XCODE, filter_graph = avfilter_graph_alloc());
ret = add_filters(&added, filter_graph, filters, filters_len, out_stream, in_stream);
if (ret < 0)
{
goto out_fail;
}
ret = avfilter_graph_config(filter_graph, NULL);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Filter graph config failed: %s\n", err2str(ret));
goto out_fail;
}
out_stream->buffersrc_ctx = filters[0].av_ctx;
out_stream->buffersink_ctx = filters[added - 1].av_ctx;
out_stream->filter_graph = filter_graph;
return 0;
out_fail:
avfilter_graph_free(&filter_graph);
return -1;
}
static int
open_filters(struct encode_ctx *ctx, struct decode_ctx *src_ctx)
{
struct filters filters[MAX_FILTERS] = { 0 };
int ret;
if (ctx->settings.encode_audio)
{
ret = define_audio_filters(filters, ARRAY_SIZE(filters), ctx->settings.with_user_filters);
if (ret < 0)
goto out_fail;
ret = create_filtergraph(&ctx->audio_stream, filters, ARRAY_SIZE(filters), &src_ctx->audio_stream);
if (ret < 0)
goto out_fail;
// Many audio encoders require a fixed frame size. This will ensure that
// the filt_frame from av_buffersink_get_frame has that size (except EOF).
if (! (ctx->audio_stream.codec->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
av_buffersink_set_frame_size(ctx->audio_stream.buffersink_ctx, ctx->audio_stream.codec->frame_size);
}
if (ctx->settings.encode_video)
{
ret = define_video_filters(filters, ARRAY_SIZE(filters), ctx->settings.with_user_filters);
if (ret < 0)
goto out_fail;
ret = create_filtergraph(&ctx->video_stream, filters, ARRAY_SIZE(filters), &src_ctx->video_stream);
if (ret < 0)
goto out_fail;
}
return 0;
out_fail:
avfilter_graph_free(&ctx->audio_stream.filter_graph);
avfilter_graph_free(&ctx->video_stream.filter_graph);
return -1;
}
static void
close_filters(struct encode_ctx *ctx)
{
avfilter_graph_free(&ctx->audio_stream.filter_graph);
avfilter_graph_free(&ctx->video_stream.filter_graph);
}
/* ----------------------------- TRANSCODE API ----------------------------- */
/* Setup */
struct decode_ctx *
transcode_decode_setup(enum transcode_profile profile, struct media_quality *quality, enum data_kind data_kind, const char *path, struct transcode_evbuf_io *evbuf_io, uint32_t len_ms)
{
struct decode_ctx *ctx;
int ret;
CHECK_NULL(L_XCODE, ctx = calloc(1, sizeof(struct decode_ctx)));
CHECK_NULL(L_XCODE, ctx->decoded_frame = av_frame_alloc());
CHECK_NULL(L_XCODE, ctx->packet = av_packet_alloc());
ctx->len_ms = len_ms;
ctx->data_kind = data_kind;
ret = init_settings(&ctx->settings, profile, quality);
if (ret < 0)
goto fail_free;
if (data_kind == DATA_KIND_HTTP)
{
ret = open_input(ctx, path, evbuf_io, PROBE_TYPE_QUICK);
// Retry with a default, slower probe size
if (ret == AVERROR_STREAM_NOT_FOUND)
ret = open_input(ctx, path, evbuf_io, PROBE_TYPE_DEFAULT);
}
else
ret = open_input(ctx, path, evbuf_io, PROBE_TYPE_DEFAULT);
if (ret < 0)
goto fail_free;
return ctx;
fail_free:
av_packet_free(&ctx->packet);
av_frame_free(&ctx->decoded_frame);
free(ctx);
return NULL;
}
struct encode_ctx *
transcode_encode_setup(enum transcode_profile profile, struct media_quality *quality, struct decode_ctx *src_ctx, int width, int height)
{
struct encode_ctx *ctx;
int src_bytes_per_sample;
int dst_bytes_per_sample;
int channels;
CHECK_NULL(L_XCODE, ctx = calloc(1, sizeof(struct encode_ctx)));
CHECK_NULL(L_XCODE, ctx->filt_frame = av_frame_alloc());
CHECK_NULL(L_XCODE, ctx->encoded_pkt = av_packet_alloc());
if (init_settings(&ctx->settings, profile, quality) < 0)
goto fail_free;
ctx->settings.width = width;
ctx->settings.height = height;
// Caller did not specify a sample rate -> use same as source
if (!ctx->settings.sample_rate && ctx->settings.encode_audio)
{
ctx->settings.sample_rate = src_ctx->audio_stream.codec->sample_rate;
}
// Caller did not specify a sample format -> determine from source
if (!ctx->settings.sample_format && ctx->settings.encode_audio)
{
src_bytes_per_sample = av_get_bytes_per_sample(src_ctx->audio_stream.codec->sample_fmt);
if (src_bytes_per_sample == 4)
{
ctx->settings.sample_format = AV_SAMPLE_FMT_S32;
ctx->settings.audio_codec = AV_CODEC_ID_PCM_S32LE;
ctx->settings.format = "s32le";
}
else
{
ctx->settings.sample_format = AV_SAMPLE_FMT_S16;
ctx->settings.audio_codec = AV_CODEC_ID_PCM_S16LE;
ctx->settings.format = "s16le";
}
}
#if USE_CH_LAYOUT
// Caller did not specify channels -> use same as source
if (!av_channel_layout_check(&ctx->settings.channel_layout) && ctx->settings.encode_audio)
{
av_channel_layout_copy(&ctx->settings.channel_layout, &src_ctx->audio_stream.codec->ch_layout);
}
channels = ctx->settings.channel_layout.nb_channels;
#else
// Caller did not specify channels -> use same as source
if (ctx->settings.channels == 0 && ctx->settings.encode_audio)
{
ctx->settings.channels = src_ctx->audio_stream.codec->channels;
ctx->settings.channel_layout = src_ctx->audio_stream.codec->channel_layout;
}
channels = ctx->settings.channels;
#endif
dst_bytes_per_sample = av_get_bytes_per_sample(ctx->settings.sample_format);
ctx->bytes_total = size_estimate(profile, ctx->settings.bit_rate, ctx->settings.sample_rate, dst_bytes_per_sample, channels, src_ctx->len_ms);
if (ctx->settings.with_wav_header)
make_wav_header(ctx->wav_header, ctx->settings.sample_rate, dst_bytes_per_sample, channels, ctx->bytes_total);
if (ctx->settings.with_icy && src_ctx->data_kind == DATA_KIND_HTTP)
ctx->icy_interval = METADATA_ICY_INTERVAL * channels * dst_bytes_per_sample * ctx->settings.sample_rate;
if (open_output(ctx, src_ctx) < 0)
goto fail_free;
if (open_filters(ctx, src_ctx) < 0)
goto fail_close;
return ctx;
fail_close:
close_output(ctx);
fail_free:
av_packet_free(&ctx->encoded_pkt);
av_frame_free(&ctx->filt_frame);
free(ctx);
return NULL;
}
struct transcode_ctx *
transcode_setup(enum transcode_profile profile, struct media_quality *quality, enum data_kind data_kind, const char *path, uint32_t len_ms)
{
struct transcode_ctx *ctx;
CHECK_NULL(L_XCODE, ctx = calloc(1, sizeof(struct transcode_ctx)));
ctx->decode_ctx = transcode_decode_setup(profile, quality, data_kind, path, NULL, len_ms);
if (!ctx->decode_ctx)
{
free(ctx);
return NULL;
}
ctx->encode_ctx = transcode_encode_setup(profile, quality, ctx->decode_ctx, 0, 0);
if (!ctx->encode_ctx)
{
transcode_decode_cleanup(&ctx->decode_ctx);
free(ctx);
return NULL;
}
return ctx;
}
struct decode_ctx *
transcode_decode_setup_raw(enum transcode_profile profile, struct media_quality *quality)
{
const AVCodecDescriptor *codec_desc;
struct decode_ctx *ctx;
#if USE_CONST_AVCODEC
const AVCodec *decoder;
#else
// Not const before ffmpeg 5.0
AVCodec *decoder;
#endif
int ret;
CHECK_NULL(L_XCODE, ctx = calloc(1, sizeof(struct decode_ctx)));
if (init_settings(&ctx->settings, profile, quality) < 0)
{
goto out_free_ctx;
}
codec_desc = avcodec_descriptor_get(ctx->settings.audio_codec);
if (!codec_desc)
{
DPRINTF(E_LOG, L_XCODE, "Invalid codec ID (%d)\n", ctx->settings.audio_codec);
goto out_free_ctx;
}
// In raw mode we won't actually need to read or decode, but we still setup
// the decode_ctx because transcode_encode_setup() gets info about the input
// through this structure (TODO dont' do that)
decoder = avcodec_find_decoder(ctx->settings.audio_codec);
if (!decoder)
{
DPRINTF(E_LOG, L_XCODE, "Could not find decoder for: %s\n", codec_desc->name);
goto out_free_ctx;
}
CHECK_NULL(L_XCODE, ctx->ifmt_ctx = avformat_alloc_context());
CHECK_NULL(L_XCODE, ctx->audio_stream.codec = avcodec_alloc_context3(decoder));
CHECK_NULL(L_XCODE, ctx->audio_stream.stream = avformat_new_stream(ctx->ifmt_ctx, NULL));
stream_settings_set(&ctx->audio_stream, &ctx->settings, decoder->type);
// Copy the data we just set to the structs we will be querying later, e.g. in open_filter
ctx->audio_stream.stream->time_base = ctx->audio_stream.codec->time_base;
ret = avcodec_parameters_from_context(ctx->audio_stream.stream->codecpar, ctx->audio_stream.codec);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Cannot copy stream parameters (%s): %s\n", codec_desc->name, err2str(ret));
goto out_free_codec;
}
return ctx;
out_free_codec:
avcodec_free_context(&ctx->audio_stream.codec);
avformat_free_context(ctx->ifmt_ctx);
out_free_ctx:
free(ctx);
return NULL;
}
enum transcode_profile
transcode_needed(const char *user_agent, const char *client_codecs, char *file_codectype)
{
const char *codectype;
const char *prefer_format;
cfg_t *lib;
bool force_xcode;
bool supports_mpeg;
bool supports_wav;
int count;
int i;
if (!file_codectype)
{
return XCODE_UNKNOWN;
}
lib = cfg_getsec(cfg, "library");
count = cfg_size(lib, "no_decode");
for (i = 0; i < count; i++)
{
codectype = cfg_getnstr(lib, "no_decode", i);
if (strcmp(file_codectype, codectype) == 0)
return XCODE_NONE; // Codectype is in no_decode
}
count = cfg_size(lib, "force_decode");
for (i = 0, force_xcode = false; i < count && !force_xcode; i++)
{
codectype = cfg_getnstr(lib, "force_decode", i);
if (strcmp(file_codectype, codectype) == 0)
force_xcode = true; // Codectype is in force_decode
}
if (!client_codecs && user_agent)
{
if (strncmp(user_agent, "iTunes", strlen("iTunes")) == 0)
client_codecs = itunes_codecs;
else if (strncmp(user_agent, "Music/", strlen("Music/")) == 0) // Apple Music, include slash because the name is generic
client_codecs = itunes_codecs;
else if (strncmp(user_agent, "QuickTime", strlen("QuickTime")) == 0)
client_codecs = itunes_codecs; // Use iTunes codecs
else if (strncmp(user_agent, "Front%20Row", strlen("Front%20Row")) == 0)
client_codecs = itunes_codecs; // Use iTunes codecs
else if (strncmp(user_agent, "AppleCoreMedia", strlen("AppleCoreMedia")) == 0)
client_codecs = itunes_codecs; // Use iTunes codecs
else if (strncmp(user_agent, "Roku", strlen("Roku")) == 0)
client_codecs = roku_codecs;
else if (strncmp(user_agent, "Hifidelio", strlen("Hifidelio")) == 0)
/* Allegedly can't transcode for Hifidelio because their
* HTTP implementation doesn't honour Connection: close.
* At least, that's why mt-daapd didn't do it.
*/
return XCODE_NONE;
}
if (!client_codecs)
client_codecs = default_codecs;
else
DPRINTF(E_SPAM, L_XCODE, "Client advertises codecs: %s\n", client_codecs);
if (!force_xcode && strstr(client_codecs, file_codectype))
return XCODE_NONE;
supports_mpeg = strstr(client_codecs, "mpeg") && avcodec_find_encoder(AV_CODEC_ID_MP3);
supports_wav = strstr(client_codecs, "wav");
prefer_format = cfg_getstr(lib, "prefer_format");
if (prefer_format)
{
if (strcmp(prefer_format, "wav") == 0 && supports_wav)
return XCODE_WAV;
else if (strcmp(prefer_format, "mpeg") == 0 && supports_mpeg)
return XCODE_MP3;
}
// This order determines the default if user didn't configure a preference.
// The lossless formats are given highest preference.
if (supports_wav)
return XCODE_WAV;
else if (supports_mpeg)
return XCODE_MP3;
else
return XCODE_UNKNOWN;
}
/* Cleanup */
void
transcode_decode_cleanup(struct decode_ctx **ctx)
{
if (!(*ctx))
return;
close_input(*ctx);
av_packet_free(&(*ctx)->packet);
av_frame_free(&(*ctx)->decoded_frame);
free(*ctx);
*ctx = NULL;
}
void
transcode_encode_cleanup(struct encode_ctx **ctx)
{
if (!*ctx)
return;
close_filters(*ctx);
close_output(*ctx);
av_packet_free(&(*ctx)->encoded_pkt);
av_frame_free(&(*ctx)->filt_frame);
free(*ctx);
*ctx = NULL;
}
void
transcode_cleanup(struct transcode_ctx **ctx)
{
if (!*ctx)
return;
transcode_encode_cleanup(&(*ctx)->encode_ctx);
transcode_decode_cleanup(&(*ctx)->decode_ctx);
free(*ctx);
*ctx = NULL;
}
/* Encoding, decoding and transcoding */
int
transcode_decode(transcode_frame **frame, struct decode_ctx *dec_ctx)
{
struct transcode_ctx ctx;
int ret;
if (dec_ctx->got_frame)
DPRINTF(E_LOG, L_XCODE, "Bug! Currently no support for multiple calls to transcode_decode()\n");
ctx.decode_ctx = dec_ctx;
ctx.encode_ctx = NULL;
do
{
// This function stops after decoding because ctx->encode_ctx is NULL
ret = read_decode_filter_encode_write(&ctx);
}
while ((ret == 0) && (!dec_ctx->got_frame));
if (ret < 0)
return -1;
*frame = dec_ctx->decoded_frame;
if (dec_ctx->eof)
return 0;
return 1;
}
// Filters and encodes
int
transcode_encode(struct evbuffer *evbuf, struct encode_ctx *ctx, transcode_frame *frame, int eof)
{
AVFrame *f = frame;
struct stream_ctx *s;
size_t start_length;
int ret;
start_length = evbuffer_get_length(ctx->obuf);
// Really crappy way of detecting if frame is audio, video or something else
#if USE_CH_LAYOUT
if (f->ch_layout.nb_channels && f->sample_rate)
#else
if (f->channel_layout && f->sample_rate)
#endif
s = &ctx->audio_stream;
else if (f->width && f->height)
s = &ctx->video_stream;
else
{
DPRINTF(E_LOG, L_XCODE, "Bug! Encoder could not detect frame type\n");
return -1;
}
ret = filter_encode_write(ctx, s, f);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error occurred while encoding: %s\n", err2str(ret));
return ret;
}
// Flush
if (eof)
{
filter_encode_write(ctx, s, NULL);
av_write_trailer(ctx->ofmt_ctx);
}
ret = evbuffer_get_length(ctx->obuf) - start_length;
evbuffer_add_buffer(evbuf, ctx->obuf);
return ret;
}
int
transcode(struct evbuffer *evbuf, int *icy_timer, struct transcode_ctx *ctx, int want_bytes)
{
size_t start_length;
int processed = 0;
int ret;
if (icy_timer)
*icy_timer = 0;
if (ctx->decode_ctx->eof)
return 0;
start_length = evbuffer_get_length(ctx->encode_ctx->obuf);
do
{
ret = read_decode_filter_encode_write(ctx);
processed = evbuffer_get_length(ctx->encode_ctx->obuf) - start_length;
}
while ((ret == 0) && (!want_bytes || (processed < want_bytes)));
evbuffer_add_buffer(evbuf, ctx->encode_ctx->obuf);
ctx->encode_ctx->bytes_processed += processed;
if (icy_timer && ctx->encode_ctx->icy_interval)
*icy_timer = (ctx->encode_ctx->bytes_processed % ctx->encode_ctx->icy_interval < processed);
if ((ret < 0) && (ret != AVERROR_EOF))
return ret;
return processed;
}
transcode_frame *
transcode_frame_new(void *data, size_t size, int nsamples, struct media_quality *quality)
{
AVFrame *f;
int ret;
f = av_frame_alloc();
if (!f)
{
DPRINTF(E_LOG, L_XCODE, "Out of memory for frame\n");
return NULL;
}
f->format = bitdepth2format(quality->bits_per_sample);
if (f->format == AV_SAMPLE_FMT_NONE)
{
DPRINTF(E_LOG, L_XCODE, "transcode_frame_new() called with unsupported bps (%d)\n", quality->bits_per_sample);
av_frame_free(&f);
return NULL;
}
f->sample_rate = quality->sample_rate;
f->nb_samples = nsamples;
#if USE_CH_LAYOUT
av_channel_layout_default(&f->ch_layout, quality->channels);
#else
f->channel_layout = av_get_default_channel_layout(quality->channels);
# ifdef HAVE_FFMPEG
f->channels = quality->channels;
# endif
#endif
f->pts = AV_NOPTS_VALUE;
// We don't align because the frame won't be given directly to the encoder
// anyway, it will first go through the filter (which might align it...?)
ret = avcodec_fill_audio_frame(f, quality->channels, f->format, data, size, 1);
if (ret < 0)
{
DPRINTF(E_LOG, L_XCODE, "Error filling frame with rawbuf, size %zu, samples %d (%d/%d/%d): %s\n",
size, nsamples, quality->sample_rate, quality->bits_per_sample, quality->channels, err2str(ret));
av_frame_free(&f);
return NULL;
}
return f;
}
void
transcode_frame_free(transcode_frame *frame)
{
AVFrame *f = frame;
av_frame_free(&f);
}
/* Seeking */
int
transcode_seek(struct transcode_ctx *ctx, int ms)
{
struct decode_ctx *dec_ctx = ctx->decode_ctx;
struct stream_ctx *s;
int64_t start_time;
int64_t target_pts;
int64_t got_pts;
int got_ms;
int ret;
s = &dec_ctx->audio_stream;
if (!s->stream)
{
DPRINTF(E_LOG, L_XCODE, "Could not seek in non-audio input\n");
return -1;
}
start_time = s->stream->start_time;
target_pts = ms;
target_pts = target_pts * AV_TIME_BASE / 1000;
target_pts = av_rescale_q(target_pts, AV_TIME_BASE_Q, s->stream->time_base);
if ((start_time != AV_NOPTS_VALUE) && (start_time > 0))
target_pts += start_time;
ret = av_seek_frame(dec_ctx->ifmt_ctx, s->stream->index, target_pts, AVSEEK_FLAG_BACKWARD);
if (ret < 0)
{
DPRINTF(E_WARN, L_XCODE, "Could not seek into stream: %s\n", err2str(ret));
return -1;
}
avcodec_flush_buffers(s->codec);
// Fast forward until first packet with a timestamp is found
s->codec->skip_frame = AVDISCARD_NONREF;
while (1)
{
dec_ctx->timestamp = av_gettime();
av_packet_unref(dec_ctx->packet);
ret = av_read_frame(dec_ctx->ifmt_ctx, dec_ctx->packet);
if (ret < 0)
{
DPRINTF(E_WARN, L_XCODE, "Could not read more data while seeking: %s\n", err2str(ret));
s->codec->skip_frame = AVDISCARD_DEFAULT;
return -1;
}
if (stream_find(dec_ctx, dec_ctx->packet->stream_index) == AVMEDIA_TYPE_UNKNOWN)
continue;
// Need a pts to return the real position
if (dec_ctx->packet->pts == AV_NOPTS_VALUE)
continue;
break;
}
s->codec->skip_frame = AVDISCARD_DEFAULT;
// Tell read_packet() to resume with dec_ctx->packet
dec_ctx->resume = 1;
// Compute position in ms from pts
got_pts = dec_ctx->packet->pts;
if ((start_time != AV_NOPTS_VALUE) && (start_time > 0))
got_pts -= start_time;
got_pts = av_rescale_q(got_pts, s->stream->time_base, AV_TIME_BASE_Q);
got_ms = got_pts / (AV_TIME_BASE / 1000);
// Since negative return would mean error, we disallow it here
if (got_ms < 0)
got_ms = 0;
DPRINTF(E_DBG, L_XCODE, "Seek wanted %d ms, got %d ms\n", ms, got_ms);
return got_ms;
}
/* Querying */
int
transcode_decode_query(struct decode_ctx *ctx, const char *query)
{
if (strcmp(query, "width") == 0)
{
if (ctx->video_stream.stream)
return ctx->video_stream.stream->codecpar->width;
}
else if (strcmp(query, "height") == 0)
{
if (ctx->video_stream.stream)
return ctx->video_stream.stream->codecpar->height;
}
else if (strcmp(query, "is_png") == 0)
{
if (ctx->video_stream.stream)
return (ctx->video_stream.stream->codecpar->codec_id == AV_CODEC_ID_PNG);
}
else if (strcmp(query, "is_jpeg") == 0)
{
if (ctx->video_stream.stream)
return (ctx->video_stream.stream->codecpar->codec_id == AV_CODEC_ID_MJPEG);
}
return -1;
}
int
transcode_encode_query(struct encode_ctx *ctx, const char *query)
{
if (strcmp(query, "sample_rate") == 0)
{
if (ctx->audio_stream.stream)
return ctx->audio_stream.stream->codecpar->sample_rate;
}
else if (strcmp(query, "bits_per_sample") == 0)
{
if (ctx->audio_stream.stream)
return av_get_bits_per_sample(ctx->audio_stream.stream->codecpar->codec_id);
}
else if (strcmp(query, "channels") == 0)
{
if (ctx->audio_stream.stream)
#if USE_CH_LAYOUT
return ctx->audio_stream.stream->codecpar->ch_layout.nb_channels;
#else
return ctx->audio_stream.stream->codecpar->channels;
#endif
}
else if (strcmp(query, "samples_per_frame") == 0)
{
if (ctx->audio_stream.stream)
return ctx->audio_stream.stream->codecpar->frame_size;
}
else if (strcmp(query, "estimated_size") == 0)
{
if (ctx->audio_stream.stream)
return ctx->bytes_total;
}
return -1;
}
/* Metadata */
struct http_icy_metadata *
transcode_metadata(struct transcode_ctx *ctx, int *changed)
{
struct http_icy_metadata *m;
if (!ctx->decode_ctx->ifmt_ctx)
return NULL;
m = http_icy_metadata_get(ctx->decode_ctx->ifmt_ctx, 1);
if (!m)
return NULL;
*changed = (m->hash != ctx->encode_ctx->icy_hash);
ctx->encode_ctx->icy_hash = m->hash;
return m;
}
void
transcode_metadata_strings_set(struct transcode_metadata_string *s, enum transcode_profile profile, struct media_quality *q, uint32_t len_ms)
{
off_t bytes;
memset(s, 0, sizeof(struct transcode_metadata_string));
switch (profile)
{
case XCODE_WAV:
s->type = "wav";
s->codectype = "wav";
s->description = "WAV audio file";
snprintf(s->bitrate, sizeof(s->bitrate), "%d", 8 * STOB(q->sample_rate, q->bits_per_sample, q->channels) / 1000); // 44100/16/2 -> 1411
bytes = size_estimate(profile, q->bit_rate, q->sample_rate, q->bits_per_sample / 8, q->channels, len_ms);
snprintf(s->file_size, sizeof(s->file_size), "%d", (int)bytes);
break;
case XCODE_MP3:
s->type = "mp3";
s->codectype = "mpeg";
s->description = "MPEG audio file";
snprintf(s->bitrate, sizeof(s->bitrate), "%d", q->bit_rate / 1000);
bytes = size_estimate(profile, q->bit_rate, q->sample_rate, q->bits_per_sample / 8, q->channels, len_ms);
snprintf(s->file_size, sizeof(s->file_size), "%d", (int)bytes);
break;
default:
DPRINTF(E_WARN, L_XCODE, "transcode_metadata_strings_set() called with unknown profile %d\n", profile);
}
}
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