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/* |
* 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 |
*/ |
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/** |
* @file |
* MxPEG decoder |
*/ |
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#include "internal.h" |
#include "mjpeg.h" |
#include "mjpegdec.h" |
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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; |
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static av_cold int mxpeg_decode_init(AVCodecContext *avctx) |
{ |
MXpegDecodeContext *s = avctx->priv_data; |
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s->jpg.picture_ptr = &s->picture[0]; |
return ff_mjpeg_decode_init(avctx); |
} |
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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)); |
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return 0; |
} |
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static int mxpeg_decode_mxm(MXpegDecodeContext *s, |
const uint8_t *buf_ptr, int buf_size) |
{ |
unsigned bitmask_size, mb_count; |
int i; |
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s->mb_width = AV_RL16(buf_ptr+4); |
s->mb_height = AV_RL16(buf_ptr+6); |
mb_count = s->mb_width * s->mb_height; |
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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); |
} |
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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); |
} |
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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); |
} |
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s->bitmask_size = bitmask_size; |
} |
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memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size); |
s->got_mxm_bitmask = 1; |
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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); |
} |
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return 0; |
} |
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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)); |
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return ret; |
} |
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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); |
} |
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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); |
} |
} |
} |
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return 0; |
} |
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static int mxpeg_decode_frame(AVCodecContext *avctx, |
void *data, 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; |
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buf_ptr = buf; |
buf_end = buf + buf_size; |
jpg->got_picture = 0; |
s->got_mxm_bitmask = 0; |
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); |
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if (start_code >= APP0 && start_code <= APP15) { |
mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size); |
} |
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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: |
s->got_sof_data = 0; |
ret = ff_mjpeg_decode_sof(jpg); |
if (ret < 0) { |
av_log(avctx, AV_LOG_ERROR, |
"SOF data decode error\n"); |
return ret; |
} |
if (jpg->interlaced) { |
av_log(avctx, AV_LOG_ERROR, |
"Interlaced mode not supported in MxPEG\n"); |
return AVERROR(EINVAL); |
} |
s->got_sof_data = 1; |
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->key_frame = 0; |
jpg->got_picture = 1; |
} else { |
jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I; |
jpg->picture_ptr->key_frame = 1; |
} |
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if (s->got_mxm_bitmask) { |
AVFrame *reference_ptr = &s->picture[s->picture_index ^ 1]; |
if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0) |
break; |
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/* 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; |
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ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, reference_ptr); |
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
return ret; |
} else { |
ret = ff_mjpeg_decode_sos(jpg, NULL, NULL); |
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) |
return ret; |
} |
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break; |
} |
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buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3; |
} |
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} |
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the_end: |
if (jpg->got_picture) { |
int ret = av_frame_ref(data, jpg->picture_ptr); |
if (ret < 0) |
return ret; |
*got_frame = 1; |
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s->picture_index ^= 1; |
jpg->picture_ptr = &s->picture[s->picture_index]; |
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if (!s->has_complete_frame) { |
if (!s->got_mxm_bitmask) |
s->has_complete_frame = 1; |
else |
*got_frame = 0; |
} |
} |
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return buf_ptr - buf; |
} |
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static av_cold int mxpeg_decode_end(AVCodecContext *avctx) |
{ |
MXpegDecodeContext *s = avctx->priv_data; |
MJpegDecodeContext *jpg = &s->jpg; |
int i; |
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jpg->picture_ptr = NULL; |
ff_mjpeg_decode_end(avctx); |
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for (i = 0; i < 2; ++i) |
av_frame_unref(&s->picture[i]); |
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av_freep(&s->mxm_bitmask); |
av_freep(&s->completion_bitmask); |
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return 0; |
} |
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AVCodec ff_mxpeg_decoder = { |
.name = "mxpeg", |
.long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_MXPEG, |
.priv_data_size = sizeof(MXpegDecodeContext), |
.init = mxpeg_decode_init, |
.close = mxpeg_decode_end, |
.decode = mxpeg_decode_frame, |
.capabilities = CODEC_CAP_DR1, |
.max_lowres = 3, |
}; |