avctx->block_align = (2 + avctx->channels * (22 + 4 * (avctx->frame_size - 1)) + 7) / 8;
break;
case AV_CODEC_ID_ADPCM_IMA_SSI:
+ case AV_CODEC_ID_ADPCM_IMA_ALP:
avctx->frame_size = s->block_size * 2 / avctx->channels;
avctx->block_align = s->block_size;
break;
return nibble;
}
+static inline uint8_t adpcm_ima_alp_compress_sample(ADPCMChannelStatus *c, int16_t sample)
+{
+ const int delta = sample - c->prev_sample;
+ const int step = ff_adpcm_step_table[c->step_index];
+ const int sign = (delta < 0) * 8;
+
+ int nibble = FFMIN(abs(delta) * 4 / step, 7);
+ int diff = (step * nibble) >> 2;
+ if (sign)
+ diff = -diff;
+
+ nibble = sign | nibble;
+
+ c->prev_sample += diff;
+ c->prev_sample = av_clip_int16(c->prev_sample);
+ c->step_index = av_clip(c->step_index + ff_adpcm_index_table[nibble], 0, 88);
+ return nibble;
+}
+
static inline uint8_t adpcm_ima_qt_compress_sample(ADPCMChannelStatus *c,
int16_t sample)
{
st = avctx->channels == 2;
if (avctx->codec_id == AV_CODEC_ID_ADPCM_IMA_SSI ||
+ avctx->codec_id == AV_CODEC_ID_ADPCM_IMA_ALP ||
avctx->codec_id == AV_CODEC_ID_ADPCM_IMA_APM)
pkt_size = (frame->nb_samples * avctx->channels) / 2;
else
flush_put_bits(&pb);
break;
}
+ case AV_CODEC_ID_ADPCM_IMA_ALP:
+ {
+ PutBitContext pb;
+ init_put_bits(&pb, dst, pkt_size);
+
+ av_assert0(avctx->trellis == 0);
+
+ for (n = frame->nb_samples / 2; n > 0; n--) {
+ for (ch = 0; ch < avctx->channels; ch++) {
+ put_bits(&pb, 4, adpcm_ima_alp_compress_sample(c->status + ch, *samples++));
+ put_bits(&pb, 4, adpcm_ima_alp_compress_sample(c->status + ch, samples[st]));
+ }
+ samples += avctx->channels;
+ }
+
+ flush_put_bits(&pb);
+ break;
+ }
case AV_CODEC_ID_ADPCM_SWF:
{
PutBitContext pb;
ADPCM_ENCODER(AV_CODEC_ID_ADPCM_ARGO, adpcm_argo, sample_fmts_p, 0, "ADPCM Argonaut Games");
ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_APM, adpcm_ima_apm, sample_fmts, AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA Ubisoft APM");
+ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_ALP, adpcm_ima_alp, sample_fmts, AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA High Voltage Software ALP");
ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt, sample_fmts_p, 0, "ADPCM IMA QuickTime");
ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_SSI, adpcm_ima_ssi, sample_fmts, AV_CODEC_CAP_SMALL_LAST_FRAME, "ADPCM IMA Simon & Schuster Interactive");
ADPCM_ENCODER(AV_CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav, sample_fmts_p, 0, "ADPCM IMA WAV");