mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-13 23:31:05 +01:00
07c179e51c
Superseded by init_ffmpeg_header_offset and various ffmpeg_make_riff_x
510 lines
15 KiB
C
510 lines
15 KiB
C
#include "../vgmstream.h"
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#include "meta.h"
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#include "../util.h"
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#ifdef VGM_USE_FFMPEG
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/* internal sizes, can be any value */
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#define FFMPEG_DEFAULT_BUFFER_SIZE 2048
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#define FFMPEG_DEFAULT_IO_BUFFER_SIZE 128 * 1024
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static int init_seek(ffmpeg_codec_data * data);
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static volatile int g_ffmpeg_initialized = 0;
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/*
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* Global FFmpeg init
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*/
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static void g_init_ffmpeg()
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{
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if (g_ffmpeg_initialized == 1)
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{
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while (g_ffmpeg_initialized < 2);
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}
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else if (g_ffmpeg_initialized == 0)
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{
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g_ffmpeg_initialized = 1;
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av_log_set_flags(AV_LOG_SKIP_REPEATED);
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av_log_set_level(AV_LOG_ERROR);
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av_register_all();
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g_ffmpeg_initialized = 2;
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}
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}
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/**
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* Generic init FFmpeg and vgmstream for any file supported by FFmpeg.
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* Always called by vgmstream when trying to identify the file type (if the player allows it).
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*/
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VGMSTREAM * init_vgmstream_ffmpeg(STREAMFILE *streamFile) {
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return init_vgmstream_ffmpeg_offset( streamFile, 0, streamFile->get_size(streamFile) );
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}
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VGMSTREAM * init_vgmstream_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size) {
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VGMSTREAM *vgmstream = NULL;
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int loop_flag = 0;
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int32_t loop_start = 0, loop_end = 0, num_samples = 0;
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/* init ffmpeg */
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ffmpeg_codec_data *data = init_ffmpeg_offset(streamFile, start, size);
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if (!data) return NULL;
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/* try to get .pos data */
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{
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uint8_t posbuf[4+4+4];
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if ( read_pos_file(posbuf, 4+4+4, streamFile) ) {
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loop_start = get_32bitLE(posbuf+0);
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loop_end = get_32bitLE(posbuf+4);
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loop_flag = 1; /* incorrect looping will be validated outside */
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/* FFmpeg can't always determine totalSamples correctly so optionally load it (can be 0/NULL)
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* won't crash and will output silence if no loop points and bigger than actual stream's samples */
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num_samples = get_32bitLE(posbuf+8);
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}
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}
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/* build VGMSTREAM */
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vgmstream = allocate_vgmstream(data->channels, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->loop_flag = loop_flag;
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vgmstream->codec_data = data;
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vgmstream->channels = data->channels;
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vgmstream->sample_rate = data->sampleRate;
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vgmstream->coding_type = coding_FFmpeg;
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vgmstream->layout_type = layout_none;
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vgmstream->meta_type = meta_FFmpeg;
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if (!num_samples) {
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num_samples = data->totalSamples;
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}
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vgmstream->num_samples = num_samples;
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if (loop_flag) {
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vgmstream->loop_start_sample = loop_start;
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vgmstream->loop_end_sample = loop_end;
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}
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/* this may happen for some streams if FFmpeg can't determine it */
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if (vgmstream->num_samples <= 0)
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goto fail;
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return vgmstream;
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fail:
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free_ffmpeg(data);
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if (vgmstream) {
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vgmstream->codec_data = NULL;
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close_vgmstream(vgmstream);
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}
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return NULL;
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}
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/**
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* AVIO callback: read stream, skipping external headers if needed
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*/
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static int ffmpeg_read(void *opaque, uint8_t *buf, int buf_size)
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{
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ffmpeg_codec_data *data = (ffmpeg_codec_data *) opaque;
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uint64_t offset = data->offset;
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int max_to_copy = 0;
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int ret;
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if (data->header_insert_block) {
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if (offset < data->header_size) {
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max_to_copy = (int)(data->header_size - offset);
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if (max_to_copy > buf_size) {
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max_to_copy = buf_size;
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}
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memcpy(buf, data->header_insert_block + offset, max_to_copy);
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buf += max_to_copy;
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buf_size -= max_to_copy;
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offset += max_to_copy;
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if (!buf_size) {
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data->offset = offset;
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return max_to_copy;
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}
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}
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offset -= data->header_size;
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}
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ret = read_streamfile(buf, offset + data->start, buf_size, data->streamfile);
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if (ret > 0) {
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offset += ret;
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if (data->header_insert_block) {
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ret += max_to_copy;
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}
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}
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if (data->header_insert_block) {
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offset += data->header_size;
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}
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data->offset = offset;
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return ret;
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}
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/**
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* AVIO callback: write stream not needed
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*/
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static int ffmpeg_write(void *opaque, uint8_t *buf, int buf_size)
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{
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return -1;
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}
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/**
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* AVIO callback: seek stream, skipping external headers if needed
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*/
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static int64_t ffmpeg_seek(void *opaque, int64_t offset, int whence)
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{
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ffmpeg_codec_data *data = (ffmpeg_codec_data *) opaque;
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if (whence & AVSEEK_SIZE) {
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return data->size + data->header_size;
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}
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whence &= ~(AVSEEK_SIZE | AVSEEK_FORCE);
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/* false offsets, on reads data->start will be added */
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switch (whence) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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offset += data->offset;
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break;
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case SEEK_END:
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offset += data->size;
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if (data->header_insert_block)
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offset += data->header_size;
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break;
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}
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if (offset > data->size + data->header_size)
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offset = data->size + data->header_size;
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return data->offset = offset;
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}
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/**
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* Manually init FFmpeg, from an offset.
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* Can be used if the stream has an extra header over data recognized by FFmpeg.
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*/
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ffmpeg_codec_data * init_ffmpeg_offset(STREAMFILE *streamFile, uint64_t start, uint64_t size) {
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return init_ffmpeg_header_offset(streamFile, NULL, 0, start, size);
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}
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/**
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* Manually init FFmpeg, from a fake header / offset.
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*
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* Can take a fake header, to trick FFmpeg into demuxing/decoding the stream.
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* This header will be seamlessly inserted before 'start' offset, and total filesize will be 'header_size' + 'size'.
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* The header buffer will be copied and memory-managed internally.
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*/
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ffmpeg_codec_data * init_ffmpeg_header_offset(STREAMFILE *streamFile, uint8_t * header, uint64_t header_size, uint64_t start, uint64_t size) {
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char filename[PATH_LIMIT];
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ffmpeg_codec_data * data;
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int errcode, i;
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int streamIndex;
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AVStream *stream;
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AVCodecParameters *codecPar;
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AVRational tb;
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/* basic setup */
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g_init_ffmpeg();
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data = ( ffmpeg_codec_data * ) calloc(1, sizeof(ffmpeg_codec_data));
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if (!data) return NULL;
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streamFile->get_name( streamFile, filename, sizeof(filename) );
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data->streamfile = streamFile->open(streamFile, filename, STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!data->streamfile) goto fail;
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data->start = start;
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data->size = size;
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/* insert fake header to trick FFmpeg into demuxing/decoding the stream */
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if (header_size > 0) {
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data->header_size = header_size;
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data->header_insert_block = av_memdup(header, header_size);
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if (!data->header_insert_block) goto fail;
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}
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/* setup IO, attempt to autodetect format and gather some info */
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data->buffer = av_malloc(FFMPEG_DEFAULT_IO_BUFFER_SIZE);
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if (!data->buffer) goto fail;
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data->ioCtx = avio_alloc_context(data->buffer, FFMPEG_DEFAULT_IO_BUFFER_SIZE, 0, data, ffmpeg_read, ffmpeg_write, ffmpeg_seek);
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if (!data->ioCtx) goto fail;
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data->formatCtx = avformat_alloc_context();
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if (!data->formatCtx) goto fail;
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data->formatCtx->pb = data->ioCtx;
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if ((errcode = avformat_open_input(&data->formatCtx, "", NULL, NULL)) < 0) goto fail; /* autodetect */
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if ((errcode = avformat_find_stream_info(data->formatCtx, NULL)) < 0) goto fail;
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/* find valid audio stream inside */
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streamIndex = -1;
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for (i = 0; i < data->formatCtx->nb_streams; ++i) {
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stream = data->formatCtx->streams[i];
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codecPar = stream->codecpar;
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if (streamIndex < 0 && codecPar->codec_type == AVMEDIA_TYPE_AUDIO) {
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streamIndex = i; /* select first audio stream found */
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} else {
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stream->discard = AVDISCARD_ALL; /* disable demuxing unneded streams */
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}
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}
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if (streamIndex < 0) goto fail;
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data->streamIndex = streamIndex;
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stream = data->formatCtx->streams[streamIndex];
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/* prepare codec and frame/packet buffers */
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data->codecCtx = avcodec_alloc_context3(NULL);
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if (!data->codecCtx) goto fail;
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if ((errcode = avcodec_parameters_to_context(data->codecCtx, codecPar)) < 0) goto fail;
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av_codec_set_pkt_timebase(data->codecCtx, stream->time_base);
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data->codec = avcodec_find_decoder(data->codecCtx->codec_id);
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if (!data->codec) goto fail;
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if ((errcode = avcodec_open2(data->codecCtx, data->codec, NULL)) < 0) goto fail;
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data->lastDecodedFrame = av_frame_alloc();
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if (!data->lastDecodedFrame) goto fail;
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av_frame_unref(data->lastDecodedFrame);
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data->lastReadPacket = malloc(sizeof(AVPacket));
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if (!data->lastReadPacket) goto fail;
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av_new_packet(data->lastReadPacket, 0);
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data->readNextPacket = 1;
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data->bytesConsumedFromDecodedFrame = INT_MAX;
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/* other setup */
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data->sampleRate = data->codecCtx->sample_rate;
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data->channels = data->codecCtx->channels;
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data->floatingPoint = 0;
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switch (data->codecCtx->sample_fmt) {
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case AV_SAMPLE_FMT_U8:
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case AV_SAMPLE_FMT_U8P:
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data->bitsPerSample = 8;
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break;
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case AV_SAMPLE_FMT_S16:
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case AV_SAMPLE_FMT_S16P:
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data->bitsPerSample = 16;
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break;
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case AV_SAMPLE_FMT_S32:
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case AV_SAMPLE_FMT_S32P:
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data->bitsPerSample = 32;
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break;
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case AV_SAMPLE_FMT_FLT:
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case AV_SAMPLE_FMT_FLTP:
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data->bitsPerSample = 32;
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data->floatingPoint = 1;
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break;
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case AV_SAMPLE_FMT_DBL:
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case AV_SAMPLE_FMT_DBLP:
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data->bitsPerSample = 64;
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data->floatingPoint = 1;
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break;
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default:
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goto fail;
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}
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data->bitrate = (int)(data->codecCtx->bit_rate);
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data->endOfStream = 0;
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data->endOfAudio = 0;
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/* try to guess frames/samples (duration isn't always set) */
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tb.num = 1; tb.den = data->codecCtx->sample_rate;
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data->totalSamples = av_rescale_q(stream->duration, stream->time_base, tb);
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if (data->totalSamples < 0)
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data->totalSamples = 0; /* caller must consider this */
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data->blockAlign = data->codecCtx->block_align;
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data->frameSize = data->codecCtx->frame_size;
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if(data->frameSize == 0) /* some formats don't set frame_size but can get on request, and vice versa */
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data->frameSize = av_get_audio_frame_duration(data->codecCtx,0);
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/* setup decode buffer */
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data->sampleBufferBlock = FFMPEG_DEFAULT_BUFFER_SIZE;
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data->sampleBuffer = av_malloc( data->sampleBufferBlock * (data->bitsPerSample / 8) * data->channels );
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if (!data->sampleBuffer)
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goto fail;
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/* setup decent seeking for faulty formats */
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errcode = init_seek(data);
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if (errcode < 0) goto fail;
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return data;
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fail:
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free_ffmpeg(data);
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return NULL;
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}
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/**
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* Special patching for FFmpeg's buggy seek code.
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*
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* To seek with avformat_seek_file/av_seek_frame, FFmpeg's demuxers can implement read_seek2 (newest API)
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* or read_seek (older API), with various search modes. If none are available it will use seek_frame_generic,
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* which manually reads frame by frame until the selected timestamp. However, the prev frame will be consumed
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* (so after seeking to 0 next av_read_frame will actually give the second frame and so on).
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*
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* Fortunately seek_frame_generic can use an index to find the correct position. This function reads the
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* first frame/packet and sets up index to timestamp 0. This ensures faulty demuxers will seek to 0 correctly.
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* Some formats may not seek to 0 even with this, though.
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*/
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static int init_seek(ffmpeg_codec_data * data) {
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int ret, ts_index, found_first = 0;
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int64_t ts = 0;
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int64_t pos = 0; /* offset */
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int size = 0; /* coded size */
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int distance = 0; /* always? */
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AVStream * stream;
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AVPacket * pkt;
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stream = data->formatCtx->streams[data->streamIndex];
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pkt = data->lastReadPacket;
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/* read_seek shouldn't need this index, but direct access to FFmpeg's internals is no good */
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/* if (data->formatCtx->iformat->read_seek || data->formatCtx->iformat->read_seek2)
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return 0; */
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/* some formats already have a proper index (e.g. M4A) */
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ts_index = av_index_search_timestamp(stream, ts, AVSEEK_FLAG_ANY);
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if (ts_index>=0)
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goto test_seek;
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/* find the first + second packets to get pos/size */
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while (1) {
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av_packet_unref(pkt);
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ret = av_read_frame(data->formatCtx, pkt);
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if (ret < 0)
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break;
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if (pkt->stream_index != data->streamIndex)
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continue; /* ignore non-selected streams */
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if (!found_first) { /* first found */
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found_first = 1;
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pos = pkt->pos;
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ts = pkt->dts;
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continue;
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} else { /* second found */
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size = pkt->pos - pos; /* coded, pkt->size is decoded size */
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break;
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}
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}
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if (!found_first)
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goto fail;
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/* in rare cases there is only one packet */
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/* if (size == 0) { size = data_end - pos; } */ /* no easy way to know, ignore (most formats don's need size) */
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/* some formats (XMA1) don't seem to have packet.dts, pretend it's 0 */
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if (ts == INT64_MIN)
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ts = 0;
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/* apparently some (non-audio?) streams start with a DTS before 0, but some read_seeks expect 0, which would disrupt the index
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* we may need to keep start_ts around, since avstream/codec/format isn't always set */
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if (ts != 0)
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goto fail;
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/* add index 0 */
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ret = av_add_index_entry(stream, pos, ts, size, distance, AVINDEX_KEYFRAME);
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if ( ret < 0 )
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return ret;
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test_seek:
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/* seek to 0 test / move back to beginning, since we just consumed packets */
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ret = avformat_seek_file(data->formatCtx, data->streamIndex, ts, ts, ts, AVSEEK_FLAG_ANY);
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if ( ret < 0 )
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return ret; /* we can't even reset_vgmstream the file */
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avcodec_flush_buffers(data->codecCtx);
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return 0;
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fail:
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return -1;
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}
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void free_ffmpeg(ffmpeg_codec_data *data) {
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if (data->lastReadPacket) {
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av_packet_unref(data->lastReadPacket);
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free(data->lastReadPacket);
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data->lastReadPacket = NULL;
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}
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if (data->lastDecodedFrame) {
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av_free(data->lastDecodedFrame);
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data->lastDecodedFrame = NULL;
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}
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if (data->codecCtx) {
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avcodec_close(data->codecCtx);
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avcodec_free_context(&(data->codecCtx));
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data->codecCtx = NULL;
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}
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if (data->formatCtx) {
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avformat_close_input(&(data->formatCtx));
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data->formatCtx = NULL;
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}
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if (data->ioCtx) {
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// buffer passed in is occasionally freed and replaced.
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// the replacement must be freed as well.
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data->buffer = data->ioCtx->buffer;
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av_free(data->ioCtx);
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data->ioCtx = NULL;
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}
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if (data->buffer) {
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av_free(data->buffer);
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data->buffer = NULL;
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}
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if (data->sampleBuffer) {
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av_free(data->sampleBuffer);
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data->sampleBuffer = NULL;
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}
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if (data->header_insert_block) {
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av_free(data->header_insert_block);
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data->header_insert_block = NULL;
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}
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if (data->streamfile) {
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close_streamfile(data->streamfile);
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data->streamfile = NULL;
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}
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free(data);
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}
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#endif
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