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lavf: add a common function for selecting a pcm codec from parameters

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This commit is contained in:
Justin Ruggles 2012-11-27 14:52:38 -05:00
parent bfe5454cd2
commit 261e9348ef
4 changed files with 57 additions and 36 deletions
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15
libavformat/internal.h
View File

@ -358,4 +358,19 @@ unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
/**
* Select a PCM codec based on the given parameters.
*
* @param bps bits-per-sample
* @param flt floating-point
* @param be big-endian
* @param sflags signed flags. each bit corresponds to one byte of bit depth.
* e.g. the 1st bit indicates if 8-bit should be signed or
* unsigned, the 2nd bit indicates if 16-bit should be signed or
* unsigned, etc... This is useful for formats such as WAVE where
* only 8-bit is unsigned and all other bit depths are signed.
* @return a PCM codec id or AV_CODEC_ID_NONE
*/
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
#endif /* AVFORMAT_INTERNAL_H */

33
libavformat/mov.c
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@ -1057,33 +1057,12 @@ static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
*/
enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
{
if (flags & 1) { // floating point
if (flags & 2) { // big endian
if (bps == 32) return AV_CODEC_ID_PCM_F32BE;
else if (bps == 64) return AV_CODEC_ID_PCM_F64BE;
} else {
if (bps == 32) return AV_CODEC_ID_PCM_F32LE;
else if (bps == 64) return AV_CODEC_ID_PCM_F64LE;
}
} else {
if (flags & 2) {
if (bps == 8)
// signed integer
if (flags & 4) return AV_CODEC_ID_PCM_S8;
else return AV_CODEC_ID_PCM_U8;
else if (bps == 16) return AV_CODEC_ID_PCM_S16BE;
else if (bps == 24) return AV_CODEC_ID_PCM_S24BE;
else if (bps == 32) return AV_CODEC_ID_PCM_S32BE;
} else {
if (bps == 8)
if (flags & 4) return AV_CODEC_ID_PCM_S8;
else return AV_CODEC_ID_PCM_U8;
else if (bps == 16) return AV_CODEC_ID_PCM_S16LE;
else if (bps == 24) return AV_CODEC_ID_PCM_S24LE;
else if (bps == 32) return AV_CODEC_ID_PCM_S32LE;
}
}
return AV_CODEC_ID_NONE;
/* lpcm flags:
* 0x1 = float
* 0x2 = big-endian
* 0x4 = signed
*/
return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
}
int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries)

15
libavformat/riff.c
View File

@ -678,15 +678,12 @@ enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
id = ff_codec_get_id(ff_codec_wav_tags, tag);
if (id <= 0)
return id;
/* handle specific u8 codec */
if (id == AV_CODEC_ID_PCM_S16LE && bps == 8)
id = AV_CODEC_ID_PCM_U8;
if (id == AV_CODEC_ID_PCM_S16LE && bps == 24)
id = AV_CODEC_ID_PCM_S24LE;
if (id == AV_CODEC_ID_PCM_S16LE && bps == 32)
id = AV_CODEC_ID_PCM_S32LE;
if (id == AV_CODEC_ID_PCM_F32LE && bps == 64)
id = AV_CODEC_ID_PCM_F64LE;
if (id == AV_CODEC_ID_PCM_S16LE)
id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
else if (id == AV_CODEC_ID_PCM_F32LE)
id = ff_get_pcm_codec_id(bps, 1, 0, 0);
if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
id = AV_CODEC_ID_PCM_ZORK;
return id;

30
libavformat/utils.c
View File

@ -2135,6 +2135,36 @@ enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag)
return AV_CODEC_ID_NONE;
}
enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags)
{
if (flt) {
switch (bps) {
case 32: return be ? AV_CODEC_ID_PCM_F32BE : AV_CODEC_ID_PCM_F32LE;
case 64: return be ? AV_CODEC_ID_PCM_F64BE : AV_CODEC_ID_PCM_F64LE;
default: return AV_CODEC_ID_NONE;
}
} else {
bps >>= 3;
if (sflags & (1 << (bps - 1))) {
switch (bps) {
case 1: return AV_CODEC_ID_PCM_S8;
case 2: return be ? AV_CODEC_ID_PCM_S16BE : AV_CODEC_ID_PCM_S16LE;
case 3: return be ? AV_CODEC_ID_PCM_S24BE : AV_CODEC_ID_PCM_S24LE;
case 4: return be ? AV_CODEC_ID_PCM_S32BE : AV_CODEC_ID_PCM_S32LE;
default: return AV_CODEC_ID_NONE;
}
} else {
switch (bps) {
case 1: return AV_CODEC_ID_PCM_U8;
case 2: return be ? AV_CODEC_ID_PCM_U16BE : AV_CODEC_ID_PCM_U16LE;
case 3: return be ? AV_CODEC_ID_PCM_U24BE : AV_CODEC_ID_PCM_U24LE;
case 4: return be ? AV_CODEC_ID_PCM_U32BE : AV_CODEC_ID_PCM_U32LE;
default: return AV_CODEC_ID_NONE;
}
}
}
}
unsigned int av_codec_get_tag(const AVCodecTag * const *tags, enum AVCodecID id)
{
int i;