mirror of
https://git.ffmpeg.org/ffmpeg.git
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268 lines
8.4 KiB
C
268 lines
8.4 KiB
C
/*
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* DPX (.dpx) image decoder
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* Copyright (c) 2009 Jimmy Christensen
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "bytestream.h"
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#include "avcodec.h"
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#include "internal.h"
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static unsigned int read32(const uint8_t **ptr, int is_big)
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{
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unsigned int temp;
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if (is_big) {
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temp = AV_RB32(*ptr);
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} else {
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temp = AV_RL32(*ptr);
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}
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*ptr += 4;
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return temp;
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}
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static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
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int * n_datum, int is_big)
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{
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if (*n_datum)
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(*n_datum)--;
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else {
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*lbuf = read32(ptr, is_big);
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*n_datum = 2;
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}
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*lbuf = (*lbuf << 10) | (*lbuf >> 22);
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return *lbuf & 0x3FF;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data,
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int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVFrame *const p = data;
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uint8_t *ptr[AV_NUM_DATA_POINTERS];
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unsigned int offset;
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int magic_num, endian;
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int x, y, i, ret;
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int w, h, bits_per_color, descriptor, elements, packing, total_size;
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unsigned int rgbBuffer = 0;
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int n_datum = 0;
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if (avpkt->size <= 1634) {
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av_log(avctx, AV_LOG_ERROR, "Packet too small for DPX header\n");
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return AVERROR_INVALIDDATA;
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}
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magic_num = AV_RB32(buf);
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buf += 4;
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/* Check if the files "magic number" is "SDPX" which means it uses
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* big-endian or XPDS which is for little-endian files */
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if (magic_num == AV_RL32("SDPX")) {
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endian = 0;
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} else if (magic_num == AV_RB32("SDPX")) {
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endian = 1;
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} else {
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av_log(avctx, AV_LOG_ERROR, "DPX marker not found\n");
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return AVERROR_INVALIDDATA;
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}
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offset = read32(&buf, endian);
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if (avpkt->size <= offset) {
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av_log(avctx, AV_LOG_ERROR, "Invalid data start offset\n");
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return AVERROR_INVALIDDATA;
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}
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// Need to end in 0x304 offset from start of file
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buf = avpkt->data + 0x304;
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w = read32(&buf, endian);
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h = read32(&buf, endian);
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if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
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return ret;
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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// Need to end in 0x320 to read the descriptor
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buf += 20;
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descriptor = buf[0];
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// Need to end in 0x323 to read the bits per color
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buf += 3;
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avctx->bits_per_raw_sample =
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bits_per_color = buf[0];
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buf++;
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packing = *((uint16_t*)buf);
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buf += 824;
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avctx->sample_aspect_ratio.num = read32(&buf, endian);
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avctx->sample_aspect_ratio.den = read32(&buf, endian);
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if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0)
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av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
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avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
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0x10000);
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else
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avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
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switch (descriptor) {
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case 51: // RGBA
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elements = 4;
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break;
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case 50: // RGB
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elements = 3;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported descriptor %d\n", descriptor);
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return AVERROR_INVALIDDATA;
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}
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switch (bits_per_color) {
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case 8:
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if (elements == 4) {
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avctx->pix_fmt = AV_PIX_FMT_RGBA;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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}
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total_size = avctx->width * avctx->height * elements;
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break;
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case 10:
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if (!packing) {
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av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
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return -1;
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}
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avctx->pix_fmt = AV_PIX_FMT_GBRP10;
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total_size = (avctx->width * elements + 2) / 3 * 4 * avctx->height;
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break;
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case 12:
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if (!packing) {
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av_log(avctx, AV_LOG_ERROR, "Packing to 16bit required\n");
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return -1;
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}
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if (endian) {
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avctx->pix_fmt = AV_PIX_FMT_GBRP12BE;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_GBRP12LE;
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}
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total_size = 2 * avctx->width * avctx->height * elements;
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break;
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case 16:
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if (endian) {
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avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64BE : AV_PIX_FMT_RGB48BE;
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} else {
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avctx->pix_fmt = elements == 4 ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGB48LE;
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}
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total_size = 2 * avctx->width * avctx->height * elements;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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// Move pointer to offset from start of file
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buf = avpkt->data + offset;
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for (i=0; i<AV_NUM_DATA_POINTERS; i++)
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ptr[i] = p->data[i];
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if (total_size + (int64_t)offset > avpkt->size) {
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av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
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return AVERROR_INVALIDDATA;
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}
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switch (bits_per_color) {
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case 10:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst[3] = {(uint16_t*)ptr[0],
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(uint16_t*)ptr[1],
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(uint16_t*)ptr[2]};
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for (y = 0; y < avctx->width; y++) {
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*dst[2]++ = read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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*dst[0]++ = read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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*dst[1]++ = read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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// For 10 bit, ignore alpha
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if (elements == 4)
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read10in32(&buf, &rgbBuffer,
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&n_datum, endian);
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}
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n_datum = 0;
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for (i = 0; i < 3; i++)
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ptr[i] += p->linesize[i];
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}
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break;
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case 12:
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for (x = 0; x < avctx->height; x++) {
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uint16_t *dst[3] = {(uint16_t*)ptr[0],
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(uint16_t*)ptr[1],
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(uint16_t*)ptr[2]};
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for (y = 0; y < avctx->width; y++) {
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*dst[2] = *((uint16_t*)buf);
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*dst[2] = (*dst[2] >> 4) | (*dst[2] << 12);
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dst[2]++;
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buf += 2;
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*dst[0] = *((uint16_t*)buf);
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*dst[0] = (*dst[0] >> 4) | (*dst[0] << 12);
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dst[0]++;
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buf += 2;
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*dst[1] = *((uint16_t*)buf);
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*dst[1] = (*dst[1] >> 4) | (*dst[1] << 12);
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dst[1]++;
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buf += 2;
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// For 12 bit, ignore alpha
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if (elements == 4)
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buf += 2;
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}
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for (i = 0; i < 3; i++)
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ptr[i] += p->linesize[i];
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}
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break;
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case 16:
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elements *= 2;
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case 8:
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for (x = 0; x < avctx->height; x++) {
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memcpy(ptr[0], buf, elements*avctx->width);
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ptr[0] += p->linesize[0];
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buf += elements*avctx->width;
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}
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break;
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}
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*got_frame = 1;
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return buf_size;
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}
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AVCodec ff_dpx_decoder = {
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.name = "dpx",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_DPX,
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.decode = decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("DPX image"),
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.capabilities = CODEC_CAP_DR1,
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};
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