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ffmpeg/libavcodec/dpx.c

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/*
* DPX (.dpx) image decoder
* Copyright (c) 2009 Jimmy Christensen
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "internal.h"
typedef struct DPXContext {
AVFrame picture;
} DPXContext;
static unsigned int read32(const uint8_t **ptr, int is_big)
{
unsigned int temp;
if (is_big) {
temp = AV_RB32(*ptr);
} else {
temp = AV_RL32(*ptr);
}
*ptr += 4;
return temp;
}
static uint16_t read10in32(const uint8_t **ptr, uint32_t * lbuf,
int * n_datum, int is_big)
{
if (*n_datum)
(*n_datum)--;
else {
*lbuf = read32(ptr, is_big);
*n_datum = 2;
}
*lbuf = (*lbuf << 10) | (*lbuf >> 22);
return *lbuf & 0x3FF;
}
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 + (int64_t)offset > 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;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
DPXContext *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->picture);
avctx->coded_frame = &s->picture;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
DPXContext *s = avctx->priv_data;
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
return 0;
}
AVCodec ff_dpx_decoder = {
.name = "dpx",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DPX,
.priv_data_size = sizeof(DPXContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("DPX image"),
.capabilities = CODEC_CAP_DR1,
};
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