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Code Issues Releases Activity

avcodec/adpcm: refactor init/flush code

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Most of the codecs just need everything zeroed. Those that don't
are either handled inline during decode, or pull state from
extradata.

Move state reset/init functionality into adpcm_flush(), and
invoke it from adpcm_decode_init().

Signed-off-by: Zane van Iperen <zane@zanevaniperen.com>
This commit is contained in:
Zane van Iperen 2021-03-31 17:23:34 +10:00
parent 9e89a23eac
commit c012f9b265
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GPG Key ID: 68616B2D8AC4DCC5
1 changed files with 29 additions and 42 deletions
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71
libavcodec/adpcm.c
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@ -103,6 +103,8 @@ typedef struct ADPCMDecodeContext {
int has_status; /**< Status flag. Reset to 0 after a flush. */
} ADPCMDecodeContext;
static void adpcm_flush(AVCodecContext *avctx);
static av_cold int adpcm_decode_init(AVCodecContext * avctx)
{
ADPCMDecodeContext *c = avctx->priv_data;
@ -150,38 +152,10 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
}
switch(avctx->codec->id) {
case AV_CODEC_ID_ADPCM_CT:
c->status[0].step = c->status[1].step = 511;
break;
case AV_CODEC_ID_ADPCM_IMA_WAV:
if (avctx->bits_per_coded_sample < 2 || avctx->bits_per_coded_sample > 5)
return AVERROR_INVALIDDATA;
break;
case AV_CODEC_ID_ADPCM_IMA_APC:
if (avctx->extradata && avctx->extradata_size >= 8) {
c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata ), 18);
c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);
}
break;
case AV_CODEC_ID_ADPCM_IMA_APM:
if (avctx->extradata) {
if (avctx->extradata_size >= 28) {
c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 16), 18);
c->status[0].step_index = av_clip(AV_RL32(avctx->extradata + 20), 0, 88);
c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);
c->status[1].step_index = av_clip(AV_RL32(avctx->extradata + 8), 0, 88);
} else if (avctx->extradata_size >= 16) {
c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 0), 18);
c->status[0].step_index = av_clip(AV_RL32(avctx->extradata + 4), 0, 88);
c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 8), 18);
c->status[1].step_index = av_clip(AV_RL32(avctx->extradata + 12), 0, 88);
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_WS:
if (avctx->extradata && avctx->extradata_size >= 2)
c->vqa_version = AV_RL16(avctx->extradata);
break;
case AV_CODEC_ID_ADPCM_ARGO:
if (avctx->bits_per_coded_sample != 4 || avctx->block_align != 17 * avctx->channels)
return AVERROR_INVALIDDATA;
@ -228,6 +202,7 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
}
adpcm_flush(avctx);
return 0;
}
@ -2110,29 +2085,41 @@ static void adpcm_flush(AVCodecContext *avctx)
{
ADPCMDecodeContext *c = avctx->priv_data;
/* Just nuke the entire state and re-init. */
memset(c, 0, sizeof(ADPCMDecodeContext));
switch(avctx->codec_id) {
case AV_CODEC_ID_ADPCM_AICA:
for (int channel = 0; channel < avctx->channels; channel++)
c->status[channel].step = 0;
case AV_CODEC_ID_ADPCM_CT:
c->status[0].step = c->status[1].step = 511;
break;
case AV_CODEC_ID_ADPCM_ARGO:
for (int channel = 0; channel < avctx->channels; channel++) {
c->status[channel].sample1 = 0;
c->status[channel].sample2 = 0;
case AV_CODEC_ID_ADPCM_IMA_APC:
if (avctx->extradata && avctx->extradata_size >= 8) {
c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata ), 18);
c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);
}
break;
case AV_CODEC_ID_ADPCM_IMA_ALP:
case AV_CODEC_ID_ADPCM_IMA_CUNNING:
case AV_CODEC_ID_ADPCM_IMA_SSI:
case AV_CODEC_ID_ADPCM_ZORK:
for (int channel = 0; channel < avctx->channels; channel++) {
c->status[channel].predictor = 0;
c->status[channel].step_index = 0;
case AV_CODEC_ID_ADPCM_IMA_APM:
if (avctx->extradata) {
if (avctx->extradata_size >= 28) {
c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 16), 18);
c->status[0].step_index = av_clip(AV_RL32(avctx->extradata + 20), 0, 88);
c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 4), 18);
c->status[1].step_index = av_clip(AV_RL32(avctx->extradata + 8), 0, 88);
} else if (avctx->extradata_size >= 16) {
c->status[0].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 0), 18);
c->status[0].step_index = av_clip(AV_RL32(avctx->extradata + 4), 0, 88);
c->status[1].predictor = av_clip_intp2(AV_RL32(avctx->extradata + 8), 18);
c->status[1].step_index = av_clip(AV_RL32(avctx->extradata + 12), 0, 88);
}
}
break;
case AV_CODEC_ID_ADPCM_IMA_WS:
if (avctx->extradata && avctx->extradata_size >= 2)
c->vqa_version = AV_RL16(avctx->extradata);
break;
default:
/* Other codecs may want to handle this during decoding. */
c->has_status = 0;