static int cllc_decode_frame(AVCodecContext *avctx, void *data, int *got_picture_ptr, AVPacket *avpkt) { CLLCContext *ctx = avctx->priv_data; AVFrame *pic = avctx->coded_frame; uint8_t *src = avpkt->data; uint8_t *swapped_buf_new; uint32_t info_tag, info_offset; GetBitContext gb; int coding_type, ret; if (pic->data[0]) avctx->release_buffer(avctx, pic); pic->reference = 0; /* Make sure our bswap16'd buffer is big enough */ swapped_buf_new = av_fast_realloc(ctx->swapped_buf, &ctx->swapped_buf_size, avpkt->size); if (!swapped_buf_new) { av_log(avctx, AV_LOG_ERROR, "Could not realloc swapped buffer.\n"); return AVERROR(ENOMEM); } ctx->swapped_buf = swapped_buf_new; /* Skip the INFO header if present */ info_offset = 0; info_tag = AV_RL32(src); if (info_tag == MKTAG('I', 'N', 'F', 'O')) { info_offset = AV_RL32(src + 4); if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) { av_log(avctx, AV_LOG_ERROR, "Invalid INFO header offset: 0x%08X is too large.\n", info_offset); return AVERROR_INVALIDDATA; } info_offset += 8; src += info_offset; av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n"); } /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */ ctx->dsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src, (avpkt->size - info_offset) / 2); init_get_bits(&gb, ctx->swapped_buf, (avpkt->size - info_offset) * 8); /* * Read in coding type. The types are as follows: * * 0 - YUY2 * 1 - BGR24 (Triples) * 2 - BGR24 (Quads) * 3 - BGRA */ coding_type = (AV_RL32(src) >> 8) & 0xFF; av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type); switch (coding_type) { case 1: case 2: avctx->pix_fmt = PIX_FMT_RGB24; avctx->bits_per_raw_sample = 8; ret = avctx->get_buffer(avctx, pic); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); return ret; } ret = decode_rgb24_frame(ctx, &gb, pic); if (ret < 0) return ret; break; case 3: avctx->pix_fmt = PIX_FMT_ARGB; avctx->bits_per_raw_sample = 8; ret = avctx->get_buffer(avctx, pic); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); return ret; } ret = decode_argb_frame(ctx, &gb, pic); if (ret < 0) return ret; break; default: av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type); return AVERROR_INVALIDDATA; } pic->key_frame = 1; pic->pict_type = AV_PICTURE_TYPE_I; *got_picture_ptr = 1; *(AVFrame *)data = *pic; return avpkt->size; }