adpcm_thp: Allow the use of extradata for the adpcm table

There are several containers that support adpcm_thp (Also known as Gamecube DSP)
streams, but only thp files contain the coeff table and previous sample inside
each frame.
Some don't even contain previous sample information at all.

This change will make it easier to implement demuxers for said containers
without having to create a new decoder.
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/adpcm.c

@@ -592,6 +592,10 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
         break;
     }
     case AV_CODEC_ID_ADPCM_THP:
+        if (avctx->extradata) {
+            nb_samples = buf_size / (8 * ch) * 14;
+            break;
+        }
         has_coded_samples = 1;
         bytestream2_skip(gb, 4); // channel size
         *coded_samples  = bytestream2_get_be32(gb);
@@ -1325,6 +1329,18 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
         int table[6][16];
         int ch;
 
+        if (avctx->extradata) {
+            GetByteContext tb;
+            if (avctx->extradata_size < 32 * avctx->channels) {
+                av_log(avctx, AV_LOG_ERROR, "Missing coeff table\n");
+                return AVERROR_INVALIDDATA;
+            }
+
+            bytestream2_init(&tb, avctx->extradata, avctx->extradata_size);
+            for (i = 0; i < avctx->channels; i++)
+                for (n = 0; n < 16; n++)
+                    table[i][n] = sign_extend(bytestream2_get_be16u(&tb), 16);
+        } else {
         for (i = 0; i < avctx->channels; i++)
             for (n = 0; n < 16; n++)
                 table[i][n] = sign_extend(bytestream2_get_be16u(&gb), 16);
@@ -1334,6 +1350,7 @@ static int adpcm_decode_frame(AVCodecContext *avctx, void *data,
             c->status[i].sample1 = sign_extend(bytestream2_get_be16u(&gb), 16);
             c->status[i].sample2 = sign_extend(bytestream2_get_be16u(&gb), 16);
         }
+        }
 
         for (ch = 0; ch < avctx->channels; ch++) {
             samples = samples_p[ch];