mirror of https://git.ffmpeg.org/ffmpeg.git
359 lines
12 KiB
C
359 lines
12 KiB
C
/*
|
|
* MxPEG decoder
|
|
* Copyright (c) 2011 Anatoly Nenashev
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
|
|
/**
|
|
* @file
|
|
* MxPEG decoder
|
|
*/
|
|
|
|
#include "libavutil/mem.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
#include "mjpeg.h"
|
|
#include "mjpegdec.h"
|
|
|
|
typedef struct MXpegDecodeContext {
|
|
MJpegDecodeContext jpg;
|
|
AVFrame *picture[2]; /* pictures array */
|
|
int picture_index; /* index of current picture */
|
|
int got_sof_data; /* true if SOF data successfully parsed */
|
|
int got_mxm_bitmask; /* true if MXM bitmask available */
|
|
uint8_t *mxm_bitmask; /* bitmask buffer */
|
|
unsigned bitmask_size; /* size of bitmask */
|
|
int has_complete_frame; /* true if has complete frame */
|
|
uint8_t *completion_bitmask; /* completion bitmask of macroblocks */
|
|
unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */
|
|
} MXpegDecodeContext;
|
|
|
|
static av_cold int mxpeg_decode_end(AVCodecContext *avctx)
|
|
{
|
|
MXpegDecodeContext *s = avctx->priv_data;
|
|
MJpegDecodeContext *jpg = &s->jpg;
|
|
int i;
|
|
|
|
jpg->picture_ptr = NULL;
|
|
ff_mjpeg_decode_end(avctx);
|
|
|
|
for (i = 0; i < 2; ++i)
|
|
av_frame_free(&s->picture[i]);
|
|
|
|
s->bitmask_size = 0;
|
|
av_freep(&s->mxm_bitmask);
|
|
av_freep(&s->completion_bitmask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
|
|
{
|
|
MXpegDecodeContext *s = avctx->priv_data;
|
|
|
|
s->picture[0] = av_frame_alloc();
|
|
s->picture[1] = av_frame_alloc();
|
|
if (!s->picture[0] || !s->picture[1])
|
|
return AVERROR(ENOMEM);
|
|
|
|
s->jpg.picture_ptr = s->picture[0];
|
|
return ff_mjpeg_decode_init(avctx);
|
|
}
|
|
|
|
static int mxpeg_decode_app(MXpegDecodeContext *s,
|
|
const uint8_t *buf_ptr, int buf_size)
|
|
{
|
|
int len;
|
|
if (buf_size < 2)
|
|
return 0;
|
|
len = AV_RB16(buf_ptr);
|
|
skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxpeg_decode_mxm(MXpegDecodeContext *s,
|
|
const uint8_t *buf_ptr, int buf_size)
|
|
{
|
|
unsigned bitmask_size, mb_count;
|
|
int i;
|
|
|
|
s->mb_width = AV_RL16(buf_ptr+4);
|
|
s->mb_height = AV_RL16(buf_ptr+6);
|
|
mb_count = s->mb_width * s->mb_height;
|
|
|
|
bitmask_size = (mb_count + 7) >> 3;
|
|
if (bitmask_size > buf_size - 12) {
|
|
av_log(s->jpg.avctx, AV_LOG_ERROR,
|
|
"MXM bitmask is not complete\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (s->bitmask_size != bitmask_size) {
|
|
s->bitmask_size = 0;
|
|
av_freep(&s->mxm_bitmask);
|
|
s->mxm_bitmask = av_malloc(bitmask_size);
|
|
if (!s->mxm_bitmask) {
|
|
av_log(s->jpg.avctx, AV_LOG_ERROR,
|
|
"MXM bitmask memory allocation error\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
av_freep(&s->completion_bitmask);
|
|
s->completion_bitmask = av_mallocz(bitmask_size);
|
|
if (!s->completion_bitmask) {
|
|
av_log(s->jpg.avctx, AV_LOG_ERROR,
|
|
"Completion bitmask memory allocation error\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
s->bitmask_size = bitmask_size;
|
|
}
|
|
|
|
memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
|
|
s->got_mxm_bitmask = 1;
|
|
|
|
if (!s->has_complete_frame) {
|
|
uint8_t completion_check = 0xFF;
|
|
for (i = 0; i < bitmask_size; ++i) {
|
|
s->completion_bitmask[i] |= s->mxm_bitmask[i];
|
|
completion_check &= s->completion_bitmask[i];
|
|
}
|
|
s->has_complete_frame = !(completion_check ^ 0xFF);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxpeg_decode_com(MXpegDecodeContext *s,
|
|
const uint8_t *buf_ptr, int buf_size)
|
|
{
|
|
int len, ret = 0;
|
|
if (buf_size < 2)
|
|
return 0;
|
|
len = AV_RB16(buf_ptr);
|
|
if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
|
|
ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
|
|
}
|
|
skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg,
|
|
AVFrame *reference_ptr)
|
|
{
|
|
if ((jpg->width + 0x0F)>>4 != s->mb_width ||
|
|
(jpg->height + 0x0F)>>4 != s->mb_height) {
|
|
av_log(jpg->avctx, AV_LOG_ERROR,
|
|
"Picture dimensions stored in SOF and MXM mismatch\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (reference_ptr->data[0]) {
|
|
int i;
|
|
for (i = 0; i < MAX_COMPONENTS; ++i) {
|
|
if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
|
|
reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
|
|
av_log(jpg->avctx, AV_LOG_ERROR,
|
|
"Dimensions of current and reference picture mismatch\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mxpeg_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
MXpegDecodeContext *s = avctx->priv_data;
|
|
MJpegDecodeContext *jpg = &s->jpg;
|
|
const uint8_t *buf_end, *buf_ptr;
|
|
const uint8_t *unescaped_buf_ptr;
|
|
int unescaped_buf_size;
|
|
int start_code;
|
|
int ret;
|
|
|
|
if (avctx->skip_frame == AVDISCARD_ALL)
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
buf_ptr = buf;
|
|
buf_end = buf + buf_size;
|
|
jpg->got_picture = 0;
|
|
s->got_mxm_bitmask = 0;
|
|
s->got_sof_data = !!s->got_sof_data;
|
|
while (buf_ptr < buf_end) {
|
|
start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
|
|
&unescaped_buf_ptr, &unescaped_buf_size);
|
|
if (start_code < 0)
|
|
goto the_end;
|
|
{
|
|
init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
|
|
|
|
if (start_code >= APP0 && start_code <= APP15) {
|
|
mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
|
|
}
|
|
|
|
switch (start_code) {
|
|
case SOI:
|
|
if (jpg->got_picture) //emulating EOI
|
|
goto the_end;
|
|
break;
|
|
case EOI:
|
|
goto the_end;
|
|
case DQT:
|
|
ret = ff_mjpeg_decode_dqt(jpg);
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"quantization table decode error\n");
|
|
return ret;
|
|
}
|
|
break;
|
|
case DHT:
|
|
ret = ff_mjpeg_decode_dht(jpg);
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"huffman table decode error\n");
|
|
return ret;
|
|
}
|
|
break;
|
|
case COM:
|
|
ret = mxpeg_decode_com(s, unescaped_buf_ptr,
|
|
unescaped_buf_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
break;
|
|
case SOF0:
|
|
if (s->got_sof_data > 1) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Multiple SOF in a frame\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ret = ff_mjpeg_decode_sof(jpg);
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"SOF data decode error\n");
|
|
s->got_sof_data = 0;
|
|
return ret;
|
|
}
|
|
if (jpg->interlaced) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Interlaced mode not supported in MxPEG\n");
|
|
s->got_sof_data = 0;
|
|
return AVERROR(EINVAL);
|
|
}
|
|
s->got_sof_data ++;
|
|
break;
|
|
case SOS:
|
|
if (!s->got_sof_data) {
|
|
av_log(avctx, AV_LOG_WARNING,
|
|
"Can not process SOS without SOF data, skipping\n");
|
|
break;
|
|
}
|
|
if (!jpg->got_picture) {
|
|
if (jpg->first_picture) {
|
|
av_log(avctx, AV_LOG_WARNING,
|
|
"First picture has no SOF, skipping\n");
|
|
break;
|
|
}
|
|
if (!s->got_mxm_bitmask){
|
|
av_log(avctx, AV_LOG_WARNING,
|
|
"Non-key frame has no MXM, skipping\n");
|
|
break;
|
|
}
|
|
/* use stored SOF data to allocate current picture */
|
|
av_frame_unref(jpg->picture_ptr);
|
|
if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
|
|
AV_GET_BUFFER_FLAG_REF)) < 0)
|
|
return ret;
|
|
jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
|
|
jpg->picture_ptr->flags &= ~AV_FRAME_FLAG_KEY;
|
|
jpg->got_picture = 1;
|
|
} else {
|
|
jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
|
|
jpg->picture_ptr->flags |= AV_FRAME_FLAG_KEY;
|
|
}
|
|
|
|
if (s->got_mxm_bitmask) {
|
|
AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
|
|
if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
|
|
break;
|
|
|
|
/* allocate dummy reference picture if needed */
|
|
if (!reference_ptr->data[0] &&
|
|
(ret = ff_get_buffer(avctx, reference_ptr,
|
|
AV_GET_BUFFER_FLAG_REF)) < 0)
|
|
return ret;
|
|
|
|
ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
|
|
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
|
|
return ret;
|
|
} else {
|
|
ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
|
|
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
|
|
return ret;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
|
|
}
|
|
|
|
}
|
|
|
|
the_end:
|
|
if (jpg->got_picture) {
|
|
int ret = av_frame_ref(rframe, jpg->picture_ptr);
|
|
if (ret < 0)
|
|
return ret;
|
|
*got_frame = 1;
|
|
|
|
s->picture_index ^= 1;
|
|
jpg->picture_ptr = s->picture[s->picture_index];
|
|
|
|
if (!s->has_complete_frame) {
|
|
if (!s->got_mxm_bitmask)
|
|
s->has_complete_frame = 1;
|
|
else
|
|
*got_frame = 0;
|
|
}
|
|
}
|
|
|
|
return buf_ptr - buf;
|
|
}
|
|
|
|
const FFCodec ff_mxpeg_decoder = {
|
|
.p.name = "mxpeg",
|
|
CODEC_LONG_NAME("Mobotix MxPEG video"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_MXPEG,
|
|
.priv_data_size = sizeof(MXpegDecodeContext),
|
|
.init = mxpeg_decode_init,
|
|
.close = mxpeg_decode_end,
|
|
FF_CODEC_DECODE_CB(mxpeg_decode_frame),
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
.p.max_lowres = 3,
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|