+ case AV_CODEC_ID_ADPCM_PSX:
+ for (channel = 0; channel < avctx->channels; channel++) {
+ samples = samples_p[channel];
+
+ /* Read in every sample for this channel. */
+ for (i = 0; i < nb_samples / 28; i++) {
+ int filter, shift, flag, byte;
+
+ filter = bytestream2_get_byteu(&gb);
+ shift = filter & 0xf;
+ filter = filter >> 4;
+ if (filter >= FF_ARRAY_ELEMS(xa_adpcm_table))
+ return AVERROR_INVALIDDATA;
+ flag = bytestream2_get_byteu(&gb);
+
+ /* Decode 28 samples. */
+ for (n = 0; n < 28; n++) {
+ int sample = 0, scale;
+
+ if (flag < 0x07) {
+ if (n & 1) {
+ scale = sign_extend(byte >> 4, 4);
+ } else {
+ byte = bytestream2_get_byteu(&gb);
+ scale = sign_extend(byte, 4);
+ }
+
+ scale = scale << 12;
+ sample = (int)((scale >> shift) + (c->status[channel].sample1 * xa_adpcm_table[filter][0] + c->status[channel].sample2 * xa_adpcm_table[filter][1]) / 64);
+ }
+ *samples++ = av_clip_int16(sample);
+ c->status[channel].sample2 = c->status[channel].sample1;
+ c->status[channel].sample1 = sample;
+ }
+ }
+ }
+ break;