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avcodec/wavarc: add support for 0CPY

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This commit is contained in:
Paul B Mahol 2023-02-07 16:54:54 +01:00
parent 0c7af7b954
commit df4ab69cfa
2 changed files with 32 additions and 3 deletions
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32
libavcodec/wavarc.c
View File

@ -35,6 +35,8 @@ typedef struct WavArcContext {
int shift;
int nb_samples;
int offset;
int align;
int add;
int eof;
int skip;
@ -68,22 +70,32 @@ static av_cold int wavarc_init(AVCodecContext *avctx)
av_channel_layout_default(&avctx->ch_layout, AV_RL16(avctx->extradata + 38));
avctx->sample_rate = AV_RL32(avctx->extradata + 40);
s->align = avctx->ch_layout.nb_channels;
switch (AV_RL16(avctx->extradata + 50)) {
case 8: avctx->sample_fmt = AV_SAMPLE_FMT_U8P; break;
case 16: avctx->sample_fmt = AV_SAMPLE_FMT_S16P; break;
case 16: s->align *= 2;
avctx->sample_fmt = AV_SAMPLE_FMT_S16P; break;
}
s->shift = 0;
switch (avctx->codec_tag) {
case MKTAG('0','C','P','Y'):
s->nb_samples = 640;
s->offset = 0;
s->add = 0;
break;
case MKTAG('1','D','I','F'):
s->nb_samples = 256;
s->offset = 4;
s->add = 0x80;
break;
case MKTAG('2','S','L','P'):
case MKTAG('3','N','L','P'):
case MKTAG('4','A','L','P'):
s->nb_samples = 570;
s->offset = 70;
s->add = 0x80;
break;
default:
return AVERROR_INVALIDDATA;
@ -142,6 +154,19 @@ static void do_stereo(WavArcContext *s, int ch, int correlated, int len)
}
}
static int decode_0cpy(AVCodecContext *avctx,
WavArcContext *s, GetBitContext *gb)
{
int bits = s->align * 8;
s->nb_samples = FFMIN(640, get_bits_left(gb) / bits);
for (int n = 0; n < s->nb_samples; n++) {
for (int ch = 0; ch < avctx->ch_layout.nb_channels; ch++)
s->samples[ch][n] = get_bits(gb, bits);
}
return 0;
}
static int decode_1dif(AVCodecContext *avctx,
WavArcContext *s, GetBitContext *gb)
{
@ -375,6 +400,9 @@ static int wavarc_decode(AVCodecContext *avctx, AVFrame *frame,
skip_bits(gb, s->skip);
switch (avctx->codec_tag) {
case MKTAG('0','C','P','Y'):
ret = decode_0cpy(avctx, s, gb);
break;
case MKTAG('1','D','I','F'):
ret = decode_1dif(avctx, s, gb);
break;
@ -413,7 +441,7 @@ fail:
const int *src = s->samples[ch] + s->offset;
for (int n = 0; n < frame->nb_samples; n++)
dst[n] = src[n] * (1 << s->shift) + 0x80U;
dst[n] = src[n] * (1 << s->shift) + s->add;
}
break;
case AV_SAMPLE_FMT_S16P:

3
libavformat/wavarc.c
View File

@ -38,7 +38,8 @@ static int wavarc_probe(const AVProbeData *p)
return 0;
id = AV_RL32(p->buf + len + 2);
if (id != MKTAG('1','D','I','F') &&
if (id != MKTAG('0','C','P','Y') &&
id != MKTAG('1','D','I','F') &&
id != MKTAG('2','S','L','P') &&
id != MKTAG('3','N','L','P') &&
id != MKTAG('4','A','L','P') &&