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Code Issues Releases Activity

Add support for PS sync extensions.

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Originally committed as revision 22818 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alex Converse
2010-04-08 06:04:41 +00:00
parent 37216b99e0
commit d14662f66a
2 changed files with 6 additions and 0 deletions
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5
libavcodec/mpeg4audio.c
View File

@@ -88,9 +88,12 @@ int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_si
if (c->chan_config < FF_ARRAY_ELEMS(ff_mpeg4audio_channels))
c->channels = ff_mpeg4audio_channels[c->chan_config];
c->sbr = -1;
c->ps = -1;
if (c->object_type == AOT_SBR || (c->object_type == AOT_PS &&
// check for W6132 Annex YYYY draft MP3onMP4
!(show_bits(&gb, 3) & 0x03 && !(show_bits(&gb, 9) & 0x3F)))) {
if (c->object_type == AOT_PS)
c->ps = 1;
c->ext_object_type = AOT_SBR;
c->sbr = 1;
c->ext_sample_rate = get_sample_rate(&gb, &c->ext_sampling_index);
@@ -121,6 +124,8 @@ int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_si
c->ext_object_type = get_object_type(&gb);
if (c->ext_object_type == AOT_SBR && (c->sbr = get_bits1(&gb)) == 1)
c->ext_sample_rate = get_sample_rate(&gb, &c->ext_sampling_index);
if (get_bits_left(&gb) > 11 && get_bits(&gb, 11) == 0x548)
c->ps = get_bits1(&gb);
break;
} else
get_bits1(&gb); // skip 1 bit

1
libavcodec/mpeg4audio.h
View File

@@ -37,6 +37,7 @@ typedef struct {
int ext_sample_rate;
int ext_chan_config;
int channels;
int ps; //< -1 implicit, 1 presence
} MPEG4AudioConfig;
extern const int ff_mpeg4audio_sample_rates[16];