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FFmpeg/libavcodec/dpx.c
Georg Lippitsch 5cc5d9d5f7 dpx: 10 and 12 bit decoding 
Rewrite 10 bit dpx decoder to decode into GBRP10 color space
instead of converting to RGB48.
Add 12 bit decoder to decode into GBRP12 color space.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-08-27 18:31:21 +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/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.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 int decode_frame(AVCodecContext *avctx,
void *data,
int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
const uint8_t *buf_end = avpkt->data + avpkt->size;
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;
int w, h, stride, bits_per_color, descriptor, elements, target_packet_size, source_packet_size;
int planar;
unsigned int rgbBuffer;
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 -1;
}
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);
// 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 += 825;
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 -1;
}
switch (bits_per_color) {
case 8:
if (elements == 4) {
avctx->pix_fmt = PIX_FMT_RGBA;
} else {
avctx->pix_fmt = PIX_FMT_RGB24;
}
source_packet_size = elements;
target_packet_size = elements;
planar = 0;
break;
case 10:
avctx->pix_fmt = PIX_FMT_GBRP10;
target_packet_size = 6;
source_packet_size = 4;
planar = 1;
break;
case 12:
if (endian) {
avctx->pix_fmt = elements == 4 ? PIX_FMT_GBRP12BE : PIX_FMT_GBRP12BE;
} else {
avctx->pix_fmt = elements == 4 ? PIX_FMT_GBRP12LE : PIX_FMT_GBRP12LE;
}
target_packet_size = 6;
source_packet_size = 6;
planar = 1;
break;
case 16:
if (endian) {
avctx->pix_fmt = elements == 4 ? PIX_FMT_RGBA64BE : PIX_FMT_RGB48BE;
} else {
avctx->pix_fmt = elements == 4 ? PIX_FMT_RGBA64LE : PIX_FMT_RGB48LE;
}
target_packet_size =
source_packet_size = elements * 2;
planar = 0;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported color depth : %d\n", bits_per_color);
return -1;
}
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
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;
}
// 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];
stride = p->linesize[0];
if (source_packet_size*avctx->width*avctx->height > buf_end - buf) {
av_log(avctx, AV_LOG_ERROR, "Overread buffer. Invalid header?\n");
return -1;
}
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++) {
rgbBuffer = read32(&buf, endian);
*dst[0]++ = (rgbBuffer >> 12) & 0x3FF;
*dst[1]++ = (rgbBuffer >> 2) & 0x3FF;
*dst[2]++ = (rgbBuffer >> 22) & 0x3FF;
}
for (i=0; i<3; i++)
ptr[i] += p->linesize[i];
}
break;
case 8:
case 12:
case 16:
if (planar) {
int source_bpc = target_packet_size / elements;
int target_bpc = target_packet_size / elements;
for (x = 0; x < avctx->height; x++) {
uint8_t *dst[AV_NUM_DATA_POINTERS];
for (i=0; i<elements; i++)
dst[i] = ptr[i];
for (y = 0; y < avctx->width; y++) {
for (i=0; i<3; i++) {
memcpy(dst[i], buf, FFMIN(source_bpc, target_bpc));
dst[i] += target_bpc;
buf += source_bpc;
}
}
for (i=0; i<elements; i++)
ptr[i] += p->linesize[i];
}
} else {
if (source_packet_size == target_packet_size) {
for (x = 0; x < avctx->height; x++) {
memcpy(ptr[0], buf, target_packet_size*avctx->width);
ptr[0] += stride;
buf += source_packet_size*avctx->width;
}
} else {
for (x = 0; x < avctx->height; x++) {
uint8_t *dst = ptr[0];
for (y = 0; y < avctx->width; y++) {
memcpy(dst, buf, target_packet_size);
dst += target_packet_size;
buf += source_packet_size;
}
ptr[0] += stride;
}
}
}
break;
}
*picture = s->picture;
*data_size = sizeof(AVPicture);
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,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("DPX image"),
};
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