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Add FLAC loop tags [ZDoom (PC)]

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This commit is contained in:
bnnm 2021-03-14 16:24:14 +01:00
parent 2e453ffa20
commit de52ee3edb
2 changed files with 21 additions and 11 deletions
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6
src/coding/ffmpeg_decoder.c
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@ -933,12 +933,14 @@ void ffmpeg_set_force_seek(ffmpeg_codec_data* data) {
const char* ffmpeg_get_metadata_value(ffmpeg_codec_data* data, const char* key) {
AVDictionary* avd;
AVDictionaryEntry* avde;
AVDictionaryEntry* avde = NULL;
if (!data || !data->codec)
return NULL;
avd = data->formatCtx->streams[data->streamIndex]->metadata;
avd = data->formatCtx->streams[data->streamIndex]->metadata; /* per stream (like Ogg) */
if (!avd)
avd = data->formatCtx->metadata; /* per format (like Flac) */
if (!avd)
return NULL;

26
src/meta/ffmpeg.c
View File

@ -4,7 +4,7 @@
#ifdef VGM_USE_FFMPEG
static int read_pos_file(uint8_t* buf, size_t bufsize, STREAMFILE* sf);
static int find_ogg_loops(ffmpeg_codec_data* data, int32_t* p_loop_start, int32_t* p_loop_end);
static int find_meta_loops(ffmpeg_codec_data* data, int32_t* p_loop_start, int32_t* p_loop_end);
/* parses any format supported by FFmpeg and not handled elsewhere:
* - MP3 (.mp3, .mus): Marc Ecko's Getting Up (PC)
@ -58,9 +58,9 @@ VGMSTREAM* init_vgmstream_ffmpeg(STREAMFILE* sf) {
}
}
/* try to read Ogg loop tags (abridged) */
if (loop_flag == 0 && read_u32be(0x00, sf) == 0x4F676753) { /* "OggS" */
loop_flag = find_ogg_loops(data, &loop_start, &loop_end);
/* try to read Ogg/Flac loop tags (abridged) */
if (!loop_flag && (is_id32be(0x00, sf, "OggS") || is_id32be(0x00, sf, "fLaC"))) {
loop_flag = find_meta_loops(data, &loop_start, &loop_end);
}
/* hack for AAC files (will return 0 samples if not an actual file) */
@ -155,22 +155,30 @@ fail:
}
/* loop tag handling could be unified with ogg_vorbis.c, but that one has a extra features too */
static int find_ogg_loops(ffmpeg_codec_data* data, int32_t* p_loop_start, int32_t* p_loop_end) {
/* loop tag handling could be unified with ogg_vorbis.c, but that one has a extra features too.
* Also has support for flac meta loops, that can be used by stuff like Platformer Game Engine
* or ZDoom/Duke Nukem 3D source ports (maybe RPG Maker too). */
//todo call ffmpeg_get_next_tag and iterate like ogg_vorbis.c
//todo also save title
static int find_meta_loops(ffmpeg_codec_data* data, int32_t* p_loop_start, int32_t* p_loop_end) {
char* endptr;
const char* value;
int loop_flag = 0;
int32_t loop_start = -1, loop_end = -1;
// Try to detect the loop flags based on current file metadata
// Try to detect the loop flags based on current file metadata (ignores case)
value = ffmpeg_get_metadata_value(data, "LoopStart");
if (value != NULL) {
if (!value)
value = ffmpeg_get_metadata_value(data, "LOOP_START"); /* ZDoom/DN3D */
if (value) {
loop_start = strtol(value, &endptr, 10);
loop_flag = 1;
}
value = ffmpeg_get_metadata_value(data, "LoopEnd");
if (value != NULL) {
if (!value)
value = ffmpeg_get_metadata_value(data, "LOOP_END"); /* ZDoom/DN3D */
if (value) {
loop_end = strtol(value, &endptr, 10);
loop_flag = 1;
}