static int sunrast_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; SUNRASTContext * const s = avctx->priv_data; AVFrame *picture = data; AVFrame * const p = &s->picture; unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen; uint8_t *ptr; const uint8_t *bufstart = buf; if (AV_RB32(buf) != 0x59a66a95) { av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n"); return -1; } w = AV_RB32(buf+4); h = AV_RB32(buf+8); depth = AV_RB32(buf+12); type = AV_RB32(buf+20); maptype = AV_RB32(buf+24); maplength = AV_RB32(buf+28); if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) { av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n"); return -1; } if (type > RT_FORMAT_IFF) { av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n"); return -1; } if (maptype & ~1) { av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n"); return -1; } buf += 32; switch (depth) { case 1: avctx->pix_fmt = PIX_FMT_MONOWHITE; break; case 8: avctx->pix_fmt = PIX_FMT_PAL8; break; case 24: avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24; break; default: av_log(avctx, AV_LOG_ERROR, "invalid depth\n"); return -1; } if (p->data[0]) avctx->release_buffer(avctx, p); if (av_image_check_size(w, h, 0, avctx)) return -1; if (w != avctx->width || h != avctx->height) avcodec_set_dimensions(avctx, w, h); if (avctx->get_buffer(avctx, p) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } p->pict_type = AV_PICTURE_TYPE_I; if (depth != 8 && maplength) { av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n"); } else if (depth == 8) { unsigned int len = maplength / 3; if (!maplength) { av_log(avctx, AV_LOG_ERROR, "colormap expected\n"); return -1; } if (maplength % 3 || maplength > 768) { av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n"); return -1; } ptr = p->data[1]; for (x=0; x<len; x++, ptr+=4) *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x]; } buf += maplength; ptr = p->data[0]; stride = p->linesize[0]; /* scanlines are aligned on 16 bit boundaries */ len = (depth * w + 7) >> 3; alen = len + (len&1); if (type == RT_BYTE_ENCODED) { int value, run; uint8_t *end = ptr + h*stride; x = 0; while (ptr != end) { run = 1; if ((value = *buf++) == 0x80) { run = *buf++ + 1; if (run != 1) value = *buf++; } while (run--) { if (x < len) ptr[x] = value; if (++x >= alen) { x = 0; ptr += stride; if (ptr == end) break; } } } } else { for (y=0; y<h; y++) { memcpy(ptr, buf, len); ptr += stride; buf += alen; } } *picture = s->picture; *data_size = sizeof(AVFrame); return buf - bufstart; }