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FFmpeg/libavcodec/dpx.c
Jerome Martinez 05e34523bc avcodec/dpx: fix check of minimal data size for unpadded content 
stride value is not relevant with unpadded content and the total count
of pixels (width x height) must be used instead of the rounding based on
width only then multiplied by height

unpadded_10bit value computing is moved sooner in the code in order to
be able to use it during computing of minimal content size. Also make sure to
only set it for 10bit.

Fix 'Overread buffer' error when the content is not lucky enough to have
(enough) padding bytes at the end for not being rejected by the formula
based on the stride value

Fixes ticket #10259.

Signed-off-by: Jerome Martinez <jerome@mediaarea.net>
Signed-off-by: Marton Balint <cus@passwd.hu>
2023-04-08 20:08:18 +02:00

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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/avstring.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/imgutils.h"
#include "libavutil/timecode.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
enum DPX_TRC {
DPX_TRC_USER_DEFINED = 0,
DPX_TRC_PRINTING_DENSITY = 1,
DPX_TRC_LINEAR = 2,
DPX_TRC_LOGARITHMIC = 3,
DPX_TRC_UNSPECIFIED_VIDEO = 4,
DPX_TRC_SMPTE_274 = 5,
DPX_TRC_ITU_R_709_4 = 6,
DPX_TRC_ITU_R_601_625 = 7,
DPX_TRC_ITU_R_601_525 = 8,
DPX_TRC_SMPTE_170 = 9,
DPX_TRC_ITU_R_624_4_PAL = 10,
DPX_TRC_Z_LINEAR = 11,
DPX_TRC_Z_HOMOGENEOUS = 12,
};
enum DPX_COL_SPEC {
DPX_COL_SPEC_USER_DEFINED = 0,
DPX_COL_SPEC_PRINTING_DENSITY = 1,
/* 2 = N/A */
/* 3 = N/A */
DPX_COL_SPEC_UNSPECIFIED_VIDEO = 4,
DPX_COL_SPEC_SMPTE_274 = 5,
DPX_COL_SPEC_ITU_R_709_4 = 6,
DPX_COL_SPEC_ITU_R_601_625 = 7,
DPX_COL_SPEC_ITU_R_601_525 = 8,
DPX_COL_SPEC_SMPTE_170 = 9,
DPX_COL_SPEC_ITU_R_624_4_PAL = 10,
/* 11 = N/A */
/* 12 = N/A */
};
static unsigned int read16(const uint8_t **ptr, int is_big)
{
unsigned int temp;
if (is_big) {
temp = AV_RB16(*ptr);
} else {
temp = AV_RL16(*ptr);
}
*ptr += 2;
return temp;
}
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_gray(const uint8_t **ptr, uint32_t *lbuf,
int *n_datum, int is_big, int shift)
{
uint16_t temp;
if (*n_datum)
(*n_datum)--;
else {
*lbuf = read32(ptr, is_big);
*n_datum = 2;
}
temp = *lbuf >> shift & 0x3FF;
*lbuf = *lbuf >> 10;
return temp;
}
static uint16_t read10in32(const uint8_t **ptr, uint32_t *lbuf,
int *n_datum, int is_big, int shift)
{
if (*n_datum)
(*n_datum)--;
else {
*lbuf = read32(ptr, is_big);
*n_datum = 2;
}
*lbuf = *lbuf << 10 | *lbuf >> shift & 0x3FFFFF;
return *lbuf & 0x3FF;
}
static uint16_t read12in32(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 = 7;
}
switch (*n_datum){
case 7: return *lbuf & 0xFFF;
case 6: return (*lbuf >> 12) & 0xFFF;
case 5: {
uint32_t c = *lbuf >> 24;
*lbuf = read32(ptr, is_big);
c |= *lbuf << 8;
return c & 0xFFF;
}
case 4: return (*lbuf >> 4) & 0xFFF;
case 3: return (*lbuf >> 16) & 0xFFF;
case 2: {
uint32_t c = *lbuf >> 28;
*lbuf = read32(ptr, is_big);
c |= *lbuf << 4;
return c & 0xFFF;
}
case 1: return (*lbuf >> 8) & 0xFFF;
default: return *lbuf >> 20;
}
}
static int decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
uint8_t *ptr[AV_NUM_DATA_POINTERS];
uint32_t header_version, version = 0;
char creator[101] = { 0 };
char input_device[33] = { 0 };
unsigned int offset;
int magic_num, endian;
int x, y, stride, i, j, ret;
int w, h, bits_per_color, descriptor, elements, packing;
int yuv, color_trc, color_spec;
int encoding, need_align = 0, unpadded_10bit = 0;
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;
}
header_version = read32(&buf, 0);
if (header_version == MKTAG('V','1','.','0'))
version = 1;
if (header_version == MKTAG('V','2','.','0'))
version = 2;
if (!version)
av_log(avctx, AV_LOG_WARNING, "Unknown header format version %s.\n",
av_fourcc2str(header_version));
// Check encryption
buf = avpkt->data + 660;
ret = read32(&buf, endian);
if (ret != 0xFFFFFFFF) {
avpriv_report_missing_feature(avctx, "Encryption");
av_log(avctx, AV_LOG_WARNING, "The image is encrypted and may "
"not properly decode.\n");
}
// Need to end in 0x304 offset from start of file
buf = avpkt->data + 0x304;
w = read32(&buf, endian);
h = read32(&buf, endian);
if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
return ret;
// Need to end in 0x320 to read the descriptor
buf += 20;
descriptor = buf[0];
color_trc = buf[1];
color_spec = buf[2];
// 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 = read16(&buf, endian);
encoding = read16(&buf, endian);
if (encoding) {
avpriv_report_missing_feature(avctx, "Encoding %d", encoding);
return AVERROR_PATCHWELCOME;
}
if (bits_per_color > 31)
return AVERROR_INVALIDDATA;
buf += 820;
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 };
/* preferred frame rate from Motion-picture film header */
if (offset >= 1724 + 4) {
buf = avpkt->data + 1724;
i = read32(&buf, endian);
if(i && i != 0xFFFFFFFF) {
AVRational q = av_d2q(av_int2float(i), 4096);
if (q.num > 0 && q.den > 0)
avctx->framerate = q;
}
}
/* alternative frame rate from television header */
if (offset >= 1940 + 4 &&
!(avctx->framerate.num && avctx->framerate.den)) {
buf = avpkt->data + 1940;
i = read32(&buf, endian);
if(i && i != 0xFFFFFFFF) {
AVRational q = av_d2q(av_int2float(i), 4096);
if (q.num > 0 && q.den > 0)
avctx->framerate = q;
}
}
/* SMPTE TC from television header */
if (offset >= 1920 + 4) {
uint32_t tc;
uint32_t *tc_sd;
char tcbuf[AV_TIMECODE_STR_SIZE];
buf = avpkt->data + 1920;
// read32 to native endian, av_bswap32 to opposite of native for
// compatibility with av_timecode_make_smpte_tc_string2 etc
tc = av_bswap32(read32(&buf, endian));
if (i != 0xFFFFFFFF) {
AVFrameSideData *tcside =
av_frame_new_side_data(p, AV_FRAME_DATA_S12M_TIMECODE,
sizeof(uint32_t) * 4);
if (!tcside)
return AVERROR(ENOMEM);
tc_sd = (uint32_t*)tcside->data;
tc_sd[0] = 1;
tc_sd[1] = tc;
av_timecode_make_smpte_tc_string2(tcbuf, avctx->framerate,
tc_sd[1], 0, 0);
av_dict_set(&p->metadata, "timecode", tcbuf, 0);
}
}
/* color range from television header */
if (offset >= 1964 + 4) {
buf = avpkt->data + 1952;
i = read32(&buf, endian);
buf = avpkt->data + 1964;
j = read32(&buf, endian);
if (i != 0xFFFFFFFF && j != 0xFFFFFFFF) {
float minCV, maxCV;
minCV = av_int2float(i);
maxCV = av_int2float(j);
if (bits_per_color >= 1 &&
minCV == 0.0f && maxCV == ((1U<<bits_per_color) - 1)) {
avctx->color_range = AVCOL_RANGE_JPEG;
} else if (bits_per_color >= 8 &&
minCV == (1 <<(bits_per_color - 4)) &&
maxCV == (235<<(bits_per_color - 8))) {
avctx->color_range = AVCOL_RANGE_MPEG;
}
}
}
switch (descriptor) {
case 1: // R
case 2: // G
case 3: // B
case 4: // A
case 6: // Y
elements = 1;
yuv = 1;
break;
case 50: // RGB
elements = 3;
yuv = 0;
break;
case 52: // ABGR
case 51: // RGBA
elements = 4;
yuv = 0;
break;
case 100: // UYVY422
elements = 2;
yuv = 1;
break;
case 102: // UYV444
elements = 3;
yuv = 1;
break;
case 103: // UYVA4444
elements = 4;
yuv = 1;
break;
default:
avpriv_report_missing_feature(avctx, "Descriptor %d", descriptor);
return AVERROR_PATCHWELCOME;
}
switch (bits_per_color) {
case 8:
stride = avctx->width * elements;
break;
case 10:
if (!packing) {
av_log(avctx, AV_LOG_ERROR, "Packing to 32bit required\n");
return -1;
}
stride = (avctx->width * elements + 2) / 3 * 4;
break;
case 12:
stride = avctx->width * elements;
if (packing) {
stride *= 2;
} else {
stride *= 3;
if (stride % 8) {
stride /= 8;
stride++;
stride *= 8;
}
stride /= 2;
}
break;
case 16:
stride = 2 * avctx->width * elements;
break;
case 32:
stride = 4 * avctx->width * elements;
break;
case 1:
case 64:
avpriv_report_missing_feature(avctx, "Depth %d", bits_per_color);
return AVERROR_PATCHWELCOME;
default:
return AVERROR_INVALIDDATA;
}
switch (color_trc) {
case DPX_TRC_LINEAR:
avctx->color_trc = AVCOL_TRC_LINEAR;
break;
case DPX_TRC_SMPTE_274:
case DPX_TRC_ITU_R_709_4:
avctx->color_trc = AVCOL_TRC_BT709;
break;
case DPX_TRC_ITU_R_601_625:
case DPX_TRC_ITU_R_601_525:
case DPX_TRC_SMPTE_170:
avctx->color_trc = AVCOL_TRC_SMPTE170M;
break;
case DPX_TRC_ITU_R_624_4_PAL:
avctx->color_trc = AVCOL_TRC_GAMMA28;
break;
case DPX_TRC_USER_DEFINED:
case DPX_TRC_UNSPECIFIED_VIDEO:
/* Nothing to do */
break;
default:
av_log(avctx, AV_LOG_VERBOSE, "Cannot map DPX transfer characteristic "
"%d to color_trc.\n", color_trc);
break;
}
switch (color_spec) {
case DPX_COL_SPEC_SMPTE_274:
case DPX_COL_SPEC_ITU_R_709_4:
avctx->color_primaries = AVCOL_PRI_BT709;
break;
case DPX_COL_SPEC_ITU_R_601_625:
case DPX_COL_SPEC_ITU_R_624_4_PAL:
avctx->color_primaries = AVCOL_PRI_BT470BG;
break;
case DPX_COL_SPEC_ITU_R_601_525:
case DPX_COL_SPEC_SMPTE_170:
avctx->color_primaries = AVCOL_PRI_SMPTE170M;
break;
case DPX_COL_SPEC_USER_DEFINED:
case DPX_COL_SPEC_UNSPECIFIED_VIDEO:
/* Nothing to do */
break;
default:
av_log(avctx, AV_LOG_VERBOSE, "Cannot map DPX color specification "
"%d to color_primaries.\n", color_spec);
break;
}
if (yuv) {
switch (color_spec) {
case DPX_COL_SPEC_SMPTE_274:
case DPX_COL_SPEC_ITU_R_709_4:
avctx->colorspace = AVCOL_SPC_BT709;
break;
case DPX_COL_SPEC_ITU_R_601_625:
case DPX_COL_SPEC_ITU_R_624_4_PAL:
avctx->colorspace = AVCOL_SPC_BT470BG;
break;
case DPX_COL_SPEC_ITU_R_601_525:
case DPX_COL_SPEC_SMPTE_170:
avctx->colorspace = AVCOL_SPC_SMPTE170M;
break;
case DPX_COL_SPEC_USER_DEFINED:
case DPX_COL_SPEC_UNSPECIFIED_VIDEO:
/* Nothing to do */
break;
default:
av_log(avctx, AV_LOG_INFO, "Cannot map DPX color specification "
"%d to colorspace.\n", color_spec);
break;
}
} else {
avctx->colorspace = AVCOL_SPC_RGB;
}
av_strlcpy(creator, avpkt->data + 160, 100);
creator[100] = '\0';
av_dict_set(&p->metadata, "Creator", creator, 0);
av_strlcpy(input_device, avpkt->data + 1556, 32);
input_device[32] = '\0';
av_dict_set(&p->metadata, "Input Device", input_device, 0);
// Some devices do not pad 10bit samples to whole 32bit words per row
if (!memcmp(input_device, "Scanity", 7) ||
!memcmp(creator, "Lasergraphics Inc.", 18)) {
if (bits_per_color == 10)
unpadded_10bit = 1;
}
// Table 3c: Runs will always break at scan line boundaries. Packing
// will always break to the next 32-bit word at scan-line boundaries.
// Unfortunately, the encoder produced invalid files, so attempt
// to detect it
// Also handle special case with unpadded content
need_align = FFALIGN(stride, 4);
if (need_align*avctx->height + (int64_t)offset > avpkt->size &&
(!unpadded_10bit || (avctx->width * avctx->height * elements + 2) / 3 * 4 + (int64_t)offset > avpkt->size)) {
// Alignment seems unappliable, try without
if (stride*avctx->height + (int64_t)offset > avpkt->size || unpadded_10bit) {
av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
return AVERROR_INVALIDDATA;
} else {
av_log(avctx, AV_LOG_INFO, "Decoding DPX without scanline "
"alignment.\n");
need_align = 0;
}
} else {
need_align -= stride;
stride = FFALIGN(stride, 4);
}
switch (1000 * descriptor + 10 * bits_per_color + endian) {
case 1081:
case 1080:
case 2081:
case 2080:
case 3081:
case 3080:
case 4081:
case 4080:
case 6081:
case 6080:
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
break;
case 6121:
case 6120:
avctx->pix_fmt = AV_PIX_FMT_GRAY12;
break;
case 1320:
case 2320:
case 3320:
case 4320:
case 6320:
avctx->pix_fmt = AV_PIX_FMT_GRAYF32LE;
break;
case 1321:
case 2321:
case 3321:
case 4321:
case 6321:
avctx->pix_fmt = AV_PIX_FMT_GRAYF32BE;
break;
case 50081:
case 50080:
avctx->pix_fmt = AV_PIX_FMT_RGB24;
break;
case 52081:
case 52080:
avctx->pix_fmt = AV_PIX_FMT_ABGR;
break;
case 51081:
case 51080:
avctx->pix_fmt = AV_PIX_FMT_RGBA;
break;
case 50100:
case 50101:
avctx->pix_fmt = AV_PIX_FMT_GBRP10;
break;
case 51100:
case 51101:
avctx->pix_fmt = AV_PIX_FMT_GBRAP10;
break;
case 50120:
case 50121:
avctx->pix_fmt = AV_PIX_FMT_GBRP12;
break;
case 51120:
case 51121:
avctx->pix_fmt = AV_PIX_FMT_GBRAP12;
break;
case 6100:
case 6101:
avctx->pix_fmt = AV_PIX_FMT_GRAY10;
break;
case 6161:
avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
break;
case 6160:
avctx->pix_fmt = AV_PIX_FMT_GRAY16LE;
break;
case 50161:
avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
break;
case 50160:
avctx->pix_fmt = AV_PIX_FMT_RGB48LE;
break;
case 51161:
avctx->pix_fmt = AV_PIX_FMT_RGBA64BE;
break;
case 51160:
avctx->pix_fmt = AV_PIX_FMT_RGBA64LE;
break;
case 50320:
avctx->pix_fmt = AV_PIX_FMT_GBRPF32LE;
break;
case 50321:
avctx->pix_fmt = AV_PIX_FMT_GBRPF32BE;
break;
case 51320:
avctx->pix_fmt = AV_PIX_FMT_GBRAPF32LE;
break;
case 51321:
avctx->pix_fmt = AV_PIX_FMT_GBRAPF32BE;
break;
case 100081:
avctx->pix_fmt = AV_PIX_FMT_UYVY422;
break;
case 102081:
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
break;
case 103081:
avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported format %d\n",
1000 * descriptor + 10 * bits_per_color + endian);
return AVERROR_PATCHWELCOME;
}
ff_set_sar(avctx, avctx->sample_aspect_ratio);
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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];
switch (bits_per_color) {
case 10:
for (x = 0; x < avctx->height; x++) {
uint16_t *dst[4] = {(uint16_t*)ptr[0],
(uint16_t*)ptr[1],
(uint16_t*)ptr[2],
(uint16_t*)ptr[3]};
int shift = elements > 1 ? packing == 1 ? 22 : 20 : packing == 1 ? 2 : 0;
for (y = 0; y < avctx->width; y++) {
if (elements >= 3)
*dst[2]++ = read10in32(&buf, &rgbBuffer,
&n_datum, endian, shift);
if (elements == 1)
*dst[0]++ = read10in32_gray(&buf, &rgbBuffer,
&n_datum, endian, shift);
else
*dst[0]++ = read10in32(&buf, &rgbBuffer,
&n_datum, endian, shift);
if (elements >= 2)
*dst[1]++ = read10in32(&buf, &rgbBuffer,
&n_datum, endian, shift);
if (elements == 4)
*dst[3]++ =
read10in32(&buf, &rgbBuffer,
&n_datum, endian, shift);
}
if (!unpadded_10bit)
n_datum = 0;
for (i = 0; i < elements; i++)
ptr[i] += p->linesize[i];
}
break;
case 12:
for (x = 0; x < avctx->height; x++) {
uint16_t *dst[4] = {(uint16_t*)ptr[0],
(uint16_t*)ptr[1],
(uint16_t*)ptr[2],
(uint16_t*)ptr[3]};
int shift = packing == 1 ? 4 : 0;
for (y = 0; y < avctx->width; y++) {
if (packing) {
if (elements >= 3)
*dst[2]++ = read16(&buf, endian) >> shift & 0xFFF;
*dst[0]++ = read16(&buf, endian) >> shift & 0xFFF;
if (elements >= 2)
*dst[1]++ = read16(&buf, endian) >> shift & 0xFFF;
if (elements == 4)
*dst[3]++ = read16(&buf, endian) >> shift & 0xFFF;
} else {
if (elements >= 3)
*dst[2]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
*dst[0]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
if (elements >= 2)
*dst[1]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
if (elements == 4)
*dst[3]++ = read12in32(&buf, &rgbBuffer,
&n_datum, endian);
}
}
n_datum = 0;
for (i = 0; i < elements; i++)
ptr[i] += p->linesize[i];
// Jump to next aligned position
buf += need_align;
}
break;
case 32:
if (elements == 1) {
av_image_copy_plane(ptr[0], p->linesize[0],
buf, stride,
elements * avctx->width * 4, avctx->height);
} else {
for (y = 0; y < avctx->height; y++) {
ptr[0] = p->data[0] + y * p->linesize[0];
ptr[1] = p->data[1] + y * p->linesize[1];
ptr[2] = p->data[2] + y * p->linesize[2];
ptr[3] = p->data[3] + y * p->linesize[3];
for (x = 0; x < avctx->width; x++) {
AV_WN32(ptr[2], AV_RN32(buf));
AV_WN32(ptr[0], AV_RN32(buf + 4));
AV_WN32(ptr[1], AV_RN32(buf + 8));
if (avctx->pix_fmt == AV_PIX_FMT_GBRAPF32BE ||
avctx->pix_fmt == AV_PIX_FMT_GBRAPF32LE) {
AV_WN32(ptr[3], AV_RN32(buf + 12));
buf += 4;
ptr[3] += 4;
}
buf += 12;
ptr[2] += 4;
ptr[0] += 4;
ptr[1] += 4;
}
}
}
break;
case 16:
elements *= 2;
case 8:
if ( avctx->pix_fmt == AV_PIX_FMT_YUVA444P
|| avctx->pix_fmt == AV_PIX_FMT_YUV444P) {
for (x = 0; x < avctx->height; x++) {
ptr[0] = p->data[0] + x * p->linesize[0];
ptr[1] = p->data[1] + x * p->linesize[1];
ptr[2] = p->data[2] + x * p->linesize[2];
ptr[3] = p->data[3] + x * p->linesize[3];
for (y = 0; y < avctx->width; y++) {
*ptr[1]++ = *buf++;
*ptr[0]++ = *buf++;
*ptr[2]++ = *buf++;
if (avctx->pix_fmt == AV_PIX_FMT_YUVA444P)
*ptr[3]++ = *buf++;
}
}
} else {
av_image_copy_plane(ptr[0], p->linesize[0],
buf, stride,
elements * avctx->width, avctx->height);
}
break;
}
*got_frame = 1;
return buf_size;
}
const FFCodec ff_dpx_decoder = {
.p.name = "dpx",
CODEC_LONG_NAME("DPX (Digital Picture Exchange) image"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_DPX,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
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