static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; DPXContext *const s = avctx->priv_data; AVFrame *picture = data; AVFrame *const p = &s->picture; uint8_t *ptr[AV_NUM_DATA_POINTERS]; unsigned int offset; int magic_num, endian; int x, y, i, ret; int w, h, bits_per_color, descriptor, elements, packing, total_size; unsigned int rgbBuffer = 0; int n_datum = 0; if (avpkt->size <= 1634) { av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n"); return AVERROR_INVALIDDATA; } magic_num = AV_RB32(buf); buf += 4; /* Check if the files "magic number" is "SDPX" which means it uses * big-endian or XPDS which is for little-endian files */ if (magic_num == AV_RL32("SDPX")) { endian = 0; } else if (magic_num == AV_RB32("SDPX")) { endian = 1; } else { av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n"); return AVERROR_INVALIDDATA; } offset = read32(&buf, endian); if (avpkt->size <= offset) { av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n"); return AVERROR_INVALIDDATA; } // Need to end in 0x304 offset from start of file buf = avpkt->data + 0x304; w = read32(&buf, endian); h = read32(&buf, endian); if ((ret = av_image_check_size(w, h, 0, avctx)) < 0) return ret; if (w != avctx->width || h != avctx->height) avcodec_set_dimensions(avctx, w, h); // Need to end in 0x320 to read the descriptor buf += 20; descriptor = buf[0]; // Need to end in 0x323 to read the bits per color buf += 3; avctx->bits_per_raw_sample = bits_per_color = buf[0]; buf++; packing = *((uint16_t*)buf); buf += 824; avctx->sample_aspect_ratio.num = read32(&buf, endian); avctx->sample_aspect_ratio.den = read32(&buf, endian); if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den, avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 0x10000); else avctx->sample_aspect_ratio = (AVRational){ 0, 1 }; switch (descriptor) { case 51: // RGBA elements = 4; break; case 50: // RGB elements = 3; break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor); return AVERROR_INVALIDDATA; } switch (bits_per_color) { case 8: if (elements == 4) { avctx->pix_fmt = AV_PIX_FMT_RGBA; } else { avctx->pix_fmt = AV_PIX_FMT_RGB24; } total_size = avctx->width * avctx->height * elements; break; case 10: if (!packing) { av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n"); return -1; } avctx->pix_fmt = AV_PIX_FMT_GBRP10; total_size = (avctx->width * avctx->height * elements + 2) / 3 * 4; break; case 12: if (!packing) { av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n"); return -1; } if (endian) { avctx->pix_fmt = AV_PIX_FMT_GBRP12BE; } else { avctx->pix_fmt = AV_PIX_FMT_GBRP12LE; } total_size = 2 * avctx->width * avctx->height * elements; break; case 16: if (endian) { avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE; } else { avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE; } total_size = 2 * avctx->width * avctx->height * elements; break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color); return AVERROR_INVALIDDATA; } if (s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); if ((ret = ff_get_buffer(avctx, p)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } // Move pointer to offset from start of file buf = avpkt->data + offset; for (i=0; i<AV_NUM_DATA_POINTERS; i++) ptr[i] = p->data[i]; if (total_size > avpkt->size) { av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n"); return AVERROR_INVALIDDATA; } switch (bits_per_color) { case 10: for (x = 0; x < avctx->height; x++) { uint16_t *dst[3] = {(uint16_t*)ptr[0], (uint16_t*)ptr[1], (uint16_t*)ptr[2]}; for (y = 0; y < avctx->width; y++) { *dst[2]++ = read10in32(&buf, &rgbBuffer, &n_datum, endian); *dst[0]++ = read10in32(&buf, &rgbBuffer, &n_datum, endian); *dst[1]++ = read10in32(&buf, &rgbBuffer, &n_datum, endian); // For 10 bit, ignore alpha if (elements == 4) read10in32(&buf, &rgbBuffer, &n_datum, endian); } for (i = 0; i < 3; i++) ptr[i] += p->linesize[i]; } break; case 12: for (x = 0; x < avctx->height; x++) { uint16_t *dst[3] = {(uint16_t*)ptr[0], (uint16_t*)ptr[1], (uint16_t*)ptr[2]}; for (y = 0; y < avctx->width; y++) { *dst[2] = *((uint16_t*)buf); *dst[2] = (*dst[2] >> 4) | (*dst[2] << 12); dst[2]++; buf += 2; *dst[0] = *((uint16_t*)buf); *dst[0] = (*dst[0] >> 4) | (*dst[0] << 12); dst[0]++; buf += 2; *dst[1] = *((uint16_t*)buf); *dst[1] = (*dst[1] >> 4) | (*dst[1] << 12); dst[1]++; buf += 2; // For 12 bit, ignore alpha if (elements == 4) buf += 2; } for (i = 0; i < 3; i++) ptr[i] += p->linesize[i]; } break; case 16: elements *= 2; case 8: for (x = 0; x < avctx->height; x++) { memcpy(ptr[0], buf, elements*avctx->width); ptr[0] += p->linesize[0]; buf += elements*avctx->width; } break; } *picture = s->picture; *got_frame = 1; return buf_size; }