static int decode_frame(AVCodecContext * avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; KmvcContext *const ctx = avctx->priv_data; uint8_t *out, *src; int i; int header; int blocksize; const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); if (ctx->pic.data[0]) avctx->release_buffer(avctx, &ctx->pic); ctx->pic.reference = 1; ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID; if (avctx->get_buffer(avctx, &ctx->pic) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } header = *buf++; /* blocksize 127 is really palette change event */ if (buf[0] == 127) { buf += 3; for (i = 0; i < 127; i++) { ctx->pal[i + (header & 0x81)] = AV_RB24(buf); buf += 4; } buf -= 127 * 4 + 3; } if (header & KMVC_KEYFRAME) { ctx->pic.key_frame = 1; ctx->pic.pict_type = AV_PICTURE_TYPE_I; } else { ctx->pic.key_frame = 0; ctx->pic.pict_type = AV_PICTURE_TYPE_P; } if (header & KMVC_PALETTE) { ctx->pic.palette_has_changed = 1; // palette starts from index 1 and has 127 entries for (i = 1; i <= ctx->palsize; i++) { ctx->pal[i] = bytestream_get_be24(&buf); } } if (pal) { ctx->pic.palette_has_changed = 1; memcpy(ctx->pal, pal, AVPALETTE_SIZE); } if (ctx->setpal) { ctx->setpal = 0; ctx->pic.palette_has_changed = 1; } /* make the palette available on the way out */ memcpy(ctx->pic.data[1], ctx->pal, 1024); blocksize = *buf++; if (blocksize != 8 && blocksize != 127) { av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize); return -1; } memset(ctx->cur, 0, 320 * 200); switch (header & KMVC_METHOD) { case 0: case 1: // used in palette changed event memcpy(ctx->cur, ctx->prev, 320 * 200); break; case 3: kmvc_decode_intra_8x8(ctx, buf, buf_size, avctx->width, avctx->height); break; case 4: kmvc_decode_inter_8x8(ctx, buf, buf_size, avctx->width, avctx->height); break; default: av_log(avctx, AV_LOG_ERROR, "Unknown compression method %i\n", header & KMVC_METHOD); return -1; } out = ctx->pic.data[0]; src = ctx->cur; for (i = 0; i < avctx->height; i++) { memcpy(out, src, avctx->width); src += 320; out += ctx->pic.linesize[0]; } /* flip buffers */ if (ctx->cur == ctx->frm0) { ctx->cur = ctx->frm1; ctx->prev = ctx->frm0; } else { ctx->cur = ctx->frm0; ctx->prev = ctx->frm1; } *data_size = sizeof(AVFrame); *(AVFrame *) data = ctx->pic; /* always report that the buffer was completely consumed */ return buf_size; }