static int aasc_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; AascContext *s = avctx->priv_data; int compr, i, stride; s->frame.reference = 3; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; if (avctx->reget_buffer(avctx, &s->frame)) { av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); return -1; } compr = AV_RL32(buf); buf += 4; buf_size -= 4; switch (avctx->codec_tag) { case MKTAG('A', 'A', 'S', '4'): bytestream2_init(&s->gb, buf - 4, buf_size + 4); ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, &s->gb); break; case MKTAG('A', 'A', 'S', 'C'): switch(compr){ case 0: stride = (avctx->width * 3 + 3) & ~3; for(i = avctx->height - 1; i >= 0; i--){ if(avctx->width*3 > buf_size){ av_log(avctx, AV_LOG_ERROR, "Next line is beyond buffer bounds\n"); break; } memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3); buf += stride; buf_size -= stride; } break; case 1: bytestream2_init(&s->gb, buf, buf_size); ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, &s->gb); break; default: av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); return -1; } break; default: av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag); return -1; } *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; /* report that the buffer was completely consumed */ return buf_size; }