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FFmpeg fixes

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- add samplesPerBlock to FFmpeg struct (for clarity)
- delete functions defs already in meta.h
- comments as I tried to understand the code better
This commit is contained in:
bnnm 2016-11-26 13:43:59 +01:00
parent d196211753
commit 75dd0d0d8b
3 changed files with 68 additions and 25 deletions
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86
src/meta/ffmpeg.c
View File

@ -4,8 +4,13 @@
#ifdef VGM_USE_FFMPEG
#define FFMPEG_DEFAULT_BLOCK_SIZE 2048
static volatile int g_ffmpeg_initialized = 0;
/*
* Global FFmpeg init
*/
static void g_init_ffmpeg()
{
if (g_ffmpeg_initialized == 1)
@ -22,24 +27,19 @@ static void g_init_ffmpeg()
}
}
ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_offset, uint64_t stream_offset, uint64_t stream_size, int fmt_big_endian);
ffmpeg_codec_data * init_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size) {
return init_ffmpeg_faux_riff(streamFile, -1, start, size, 0);
}
VGMSTREAM * init_vgmstream_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size);
/**
* Generic init FFmpeg and vgmstream for any file supported by FFmpeg.
* Always called by vgmstream when trying to identify the file type (if the player allows it).
*/
VGMSTREAM * init_vgmstream_ffmpeg(STREAMFILE *streamFile) {
return init_vgmstream_ffmpeg_offset( streamFile, 0, streamFile->get_size(streamFile) );
}
void free_ffmpeg(ffmpeg_codec_data *data);
VGMSTREAM * init_vgmstream_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size) {
VGMSTREAM *vgmstream = NULL;
ffmpeg_codec_data *data = init_ffmpeg_offset(streamFile, start, size);
if (!data) return NULL;
vgmstream = allocate_vgmstream(data->channels, 0);
@ -53,7 +53,7 @@ VGMSTREAM * init_vgmstream_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start,
vgmstream->coding_type = coding_FFmpeg;
vgmstream->layout_type = layout_none;
vgmstream->meta_type = meta_FFmpeg;
return vgmstream;
fail:
@ -62,6 +62,10 @@ fail:
return NULL;
}
/**
* AVIO callback: read stream, skipping external headers if needed
*/
static int ffmpeg_read(void *opaque, uint8_t *buf, int buf_size)
{
ffmpeg_codec_data *data = (ffmpeg_codec_data *) opaque;
@ -100,11 +104,17 @@ static int ffmpeg_read(void *opaque, uint8_t *buf, int buf_size)
return ret;
}
/**
* AVIO callback: write stream not needed
*/
static int ffmpeg_write(void *opaque, uint8_t *buf, int buf_size)
{
return -1;
}
/**
* AVIO callback: seek stream, skipping external headers if needed
*/
static int64_t ffmpeg_seek(void *opaque, int64_t offset, int whence)
{
ffmpeg_codec_data *data = (ffmpeg_codec_data *) opaque;
@ -128,6 +138,19 @@ static int64_t ffmpeg_seek(void *opaque, int64_t offset, int whence)
return data->offset = offset;
}
/**
* Manually init FFmpeg only, from an offset.
* Can be used if the stream has an extra header over data recognized by FFmpeg.
*/
ffmpeg_codec_data * init_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size) {
return init_ffmpeg_faux_riff(streamFile, -1, start, size, 0);
}
/**
* Manually init FFmpeg only, from an offset / fake RIFF.
* Can insert a fake RIFF header, to trick FFmpeg into demuxing/decoding the stream.
*/
ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_offset, uint64_t start, uint64_t size, int big_endian) {
char filename[PATH_LIMIT];
@ -139,12 +162,13 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
AVCodecParameters *codecPar;
AVRational tb;
/* basic setup */
g_init_ffmpeg();
data = ( ffmpeg_codec_data * ) calloc(1, sizeof(ffmpeg_codec_data));
if (!data) return 0;
if (!data) return NULL;
streamFile->get_name( streamFile, filename, sizeof(filename) );
@ -153,7 +177,9 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
data->start = start;
data->size = size;
/* insert fake RIFF header to trick FFmpeg into demuxing/decoding the stream */
if (fmt_offset > 0) {
int max_header_size = (int)(start - fmt_offset);
uint8_t *p;
@ -188,6 +214,8 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
put_32bitLE(p + data->header_size - 4, size);
}
/* setup IO, attempt to autodetect format and gather some info */
data->buffer = av_malloc(128 * 1024);
if (!data->buffer) goto fail;
@ -199,10 +227,12 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
data->formatCtx->pb = data->ioCtx;
if ((errcode = avformat_open_input(&data->formatCtx, "", NULL, NULL)) < 0) goto fail;
if ((errcode = avformat_open_input(&data->formatCtx, "", NULL, NULL)) < 0) goto fail; /* autodetect */
if ((errcode = avformat_find_stream_info(data->formatCtx, NULL)) < 0) goto fail;
/* find valid audio stream inside */
streamIndex = -1;
for (i = 0; i < data->formatCtx->nb_streams; ++i) {
@ -217,6 +247,8 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
data->streamIndex = streamIndex;
/* prepare codec and frame/packet buffers */
data->codecCtx = avcodec_alloc_context3(NULL);
if (!data->codecCtx) goto fail;
@ -232,12 +264,16 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
data->lastDecodedFrame = av_frame_alloc();
if (!data->lastDecodedFrame) goto fail;
av_frame_unref(data->lastDecodedFrame);
data->lastReadPacket = malloc(sizeof(AVPacket));
if (!data->lastReadPacket) goto fail;
av_new_packet(data->lastReadPacket, 0);
data->readNextPacket = 1;
data->bytesConsumedFromDecodedFrame = INT_MAX;
/* other setup */
data->sampleRate = data->codecCtx->sample_rate;
data->channels = data->codecCtx->channels;
data->floatingPoint = 0;
@ -274,18 +310,21 @@ ffmpeg_codec_data * init_ffmpeg_faux_riff(STREAMFILE *streamFile, int64_t fmt_of
goto fail;
}
tb.num = 1; tb.den = data->codecCtx->sample_rate;
data->totalFrames = av_rescale_q(data->formatCtx->streams[streamIndex]->duration, data->formatCtx->streams[streamIndex]->time_base, tb);
data->bitrate = (int)(data->codecCtx->bit_rate);
data->framesRead = 0;
data->endOfStream = 0;
data->endOfAudio = 0;
/* try to guess frames/samples (duration isn't always set) */
tb.num = 1; tb.den = data->codecCtx->sample_rate;
data->totalFrames = av_rescale_q(data->formatCtx->streams[streamIndex]->duration, data->formatCtx->streams[streamIndex]->time_base, tb);
if (data->totalFrames < 0)
data->totalFrames = 0;
data->sampleBuffer = av_malloc( 2048 * (data->bitsPerSample / 8) * data->channels );
/* setup decode buffer */
data->samplesPerBlock = FFMPEG_DEFAULT_BLOCK_SIZE;
data->sampleBuffer = av_malloc( data->samplesPerBlock * (data->bitsPerSample / 8) * data->channels );
if (!data->sampleBuffer)
goto fail;
@ -297,6 +336,7 @@ fail:
return NULL;
}
void free_ffmpeg(ffmpeg_codec_data *data) {
if (data->lastReadPacket) {
av_packet_unref(data->lastReadPacket);

4
src/vgmstream.c
View File

@ -1086,7 +1086,7 @@ int get_vgmstream_samples_per_frame(VGMSTREAM * vgmstream) {
ffmpeg_codec_data *data = (ffmpeg_codec_data *) vgmstream->codec_data;
if (vgmstream->codec_data) {
int64_t samplesRemain = data->totalFrames - data->framesRead;
return samplesRemain > 2048 ? 2048 : samplesRemain;
return samplesRemain > data->samplesPerBlock ? data->samplesPerBlock : samplesRemain;
}
return 0;
}
@ -1914,7 +1914,7 @@ void describe_vgmstream(VGMSTREAM * vgmstream, char * desc, int length) {
return;
}
snprintf(temp,TEMPSIZE,"sample rate %d Hz\n"
snprintf(temp,TEMPSIZE,"sample rate: %d Hz\n"
"channels: %d\n",
vgmstream->sample_rate,vgmstream->channels);
concatn(length,desc,temp);

3
src/vgmstream.h
View File

@ -856,6 +856,7 @@ typedef struct {
// inserted header, ie. fake RIFF header
uint8_t *header_insert_block;
// header/fake RIFF over the real (parseable by FFmpeg) file start
uint64_t header_size;
// stream info
@ -869,6 +870,8 @@ typedef struct {
// Intermediate buffer
uint8_t *sampleBuffer;
// max samples a block can held (can be less or more than samples per decoded frame)
size_t samplesPerBlock;
// FFmpeg context used for metadata
AVCodec *codec;