3 * Copyright (c) 2011 Anatoly Nenashev
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
32 typedef struct MXpegDecodeContext {
33 MJpegDecodeContext jpg;
34 AVFrame picture[2]; /* pictures array */
35 int picture_index; /* index of current picture */
36 int got_sof_data; /* true if SOF data successfully parsed */
37 int got_mxm_bitmask; /* true if MXM bitmask available */
38 uint8_t *mxm_bitmask; /* bitmask buffer */
39 unsigned bitmask_size; /* size of bitmask */
40 int has_complete_frame; /* true if has complete frame */
41 uint8_t *completion_bitmask; /* completion bitmask of macroblocks */
42 unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */
45 static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
47 MXpegDecodeContext *s = avctx->priv_data;
49 s->picture[0].reference = s->picture[1].reference = 3;
50 s->jpg.picture_ptr = &s->picture[0];
51 return ff_mjpeg_decode_init(avctx);
54 static int mxpeg_decode_app(MXpegDecodeContext *s,
55 const uint8_t *buf_ptr, int buf_size)
60 len = AV_RB16(buf_ptr);
61 skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
66 static int mxpeg_decode_mxm(MXpegDecodeContext *s,
67 const uint8_t *buf_ptr, int buf_size)
69 unsigned bitmask_size, mb_count;
72 s->mb_width = AV_RL16(buf_ptr+4);
73 s->mb_height = AV_RL16(buf_ptr+6);
74 mb_count = s->mb_width * s->mb_height;
76 bitmask_size = (mb_count + 7) >> 3;
77 if (bitmask_size > buf_size - 12) {
78 av_log(s->jpg.avctx, AV_LOG_ERROR,
79 "MXM bitmask is not complete\n");
80 return AVERROR(EINVAL);
83 if (s->bitmask_size != bitmask_size) {
85 av_freep(&s->mxm_bitmask);
86 s->mxm_bitmask = av_malloc(bitmask_size);
87 if (!s->mxm_bitmask) {
88 av_log(s->jpg.avctx, AV_LOG_ERROR,
89 "MXM bitmask memory allocation error\n");
90 return AVERROR(ENOMEM);
93 av_freep(&s->completion_bitmask);
94 s->completion_bitmask = av_mallocz(bitmask_size);
95 if (!s->completion_bitmask) {
96 av_log(s->jpg.avctx, AV_LOG_ERROR,
97 "Completion bitmask memory allocation error\n");
98 return AVERROR(ENOMEM);
101 s->bitmask_size = bitmask_size;
104 memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
105 s->got_mxm_bitmask = 1;
107 if (!s->has_complete_frame) {
108 uint8_t completion_check = 0xFF;
109 for (i = 0; i < bitmask_size; ++i) {
110 s->completion_bitmask[i] |= s->mxm_bitmask[i];
111 completion_check &= s->completion_bitmask[i];
113 s->has_complete_frame = !(completion_check ^ 0xFF);
119 static int mxpeg_decode_com(MXpegDecodeContext *s,
120 const uint8_t *buf_ptr, int buf_size)
125 len = AV_RB16(buf_ptr);
126 if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
127 ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
129 skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
134 static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg,
135 AVFrame *reference_ptr)
137 if ((jpg->width + 0x0F)>>4 != s->mb_width ||
138 (jpg->height + 0x0F)>>4 != s->mb_height) {
139 av_log(jpg->avctx, AV_LOG_ERROR,
140 "Picture dimensions stored in SOF and MXM mismatch\n");
141 return AVERROR(EINVAL);
144 if (reference_ptr->data[0]) {
146 for (i = 0; i < MAX_COMPONENTS; ++i) {
147 if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
148 reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
149 av_log(jpg->avctx, AV_LOG_ERROR,
150 "Dimensions of current and reference picture mismatch\n");
151 return AVERROR(EINVAL);
159 static int mxpeg_decode_frame(AVCodecContext *avctx,
160 void *data, int *got_frame,
163 const uint8_t *buf = avpkt->data;
164 int buf_size = avpkt->size;
165 MXpegDecodeContext *s = avctx->priv_data;
166 MJpegDecodeContext *jpg = &s->jpg;
167 const uint8_t *buf_end, *buf_ptr;
168 const uint8_t *unescaped_buf_ptr;
169 int unescaped_buf_size;
171 AVFrame *picture = data;
175 buf_end = buf + buf_size;
176 jpg->got_picture = 0;
177 s->got_mxm_bitmask = 0;
178 while (buf_ptr < buf_end) {
179 start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
180 &unescaped_buf_ptr, &unescaped_buf_size);
184 init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
186 if (start_code >= APP0 && start_code <= APP15) {
187 mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
190 switch (start_code) {
192 if (jpg->got_picture) //emulating EOI
198 ret = ff_mjpeg_decode_dqt(jpg);
200 av_log(avctx, AV_LOG_ERROR,
201 "quantization table decode error\n");
206 ret = ff_mjpeg_decode_dht(jpg);
208 av_log(avctx, AV_LOG_ERROR,
209 "huffman table decode error\n");
214 ret = mxpeg_decode_com(s, unescaped_buf_ptr,
221 ret = ff_mjpeg_decode_sof(jpg);
223 av_log(avctx, AV_LOG_ERROR,
224 "SOF data decode error\n");
227 if (jpg->interlaced) {
228 av_log(avctx, AV_LOG_ERROR,
229 "Interlaced mode not supported in MxPEG\n");
230 return AVERROR(EINVAL);
235 if (!s->got_sof_data) {
236 av_log(avctx, AV_LOG_WARNING,
237 "Can not process SOS without SOF data, skipping\n");
240 if (!jpg->got_picture) {
241 if (jpg->first_picture) {
242 av_log(avctx, AV_LOG_WARNING,
243 "First picture has no SOF, skipping\n");
246 if (!s->got_mxm_bitmask){
247 av_log(avctx, AV_LOG_WARNING,
248 "Non-key frame has no MXM, skipping\n");
251 /* use stored SOF data to allocate current picture */
252 if (jpg->picture_ptr->data[0])
253 avctx->release_buffer(avctx, jpg->picture_ptr);
254 if (ff_get_buffer(avctx, jpg->picture_ptr) < 0) {
255 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
256 return AVERROR(ENOMEM);
258 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
259 jpg->picture_ptr->key_frame = 0;
260 jpg->got_picture = 1;
262 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
263 jpg->picture_ptr->key_frame = 1;
266 if (s->got_mxm_bitmask) {
267 AVFrame *reference_ptr = &s->picture[s->picture_index ^ 1];
268 if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
271 /* allocate dummy reference picture if needed */
272 if (!reference_ptr->data[0] &&
273 ff_get_buffer(avctx, reference_ptr) < 0) {
274 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
275 return AVERROR(ENOMEM);
278 ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, reference_ptr);
279 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
282 ret = ff_mjpeg_decode_sos(jpg, NULL, NULL);
283 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
290 buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
296 if (jpg->got_picture) {
298 *picture = *jpg->picture_ptr;
299 s->picture_index ^= 1;
300 jpg->picture_ptr = &s->picture[s->picture_index];
302 if (!s->has_complete_frame) {
303 if (!s->got_mxm_bitmask)
304 s->has_complete_frame = 1;
310 return buf_ptr - buf;
313 static av_cold int mxpeg_decode_end(AVCodecContext *avctx)
315 MXpegDecodeContext *s = avctx->priv_data;
316 MJpegDecodeContext *jpg = &s->jpg;
319 jpg->picture_ptr = NULL;
320 ff_mjpeg_decode_end(avctx);
322 for (i = 0; i < 2; ++i) {
323 if (s->picture[i].data[0])
324 avctx->release_buffer(avctx, &s->picture[i]);
327 av_freep(&s->mxm_bitmask);
328 av_freep(&s->completion_bitmask);
333 AVCodec ff_mxpeg_decoder = {
335 .long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
336 .type = AVMEDIA_TYPE_VIDEO,
337 .id = AV_CODEC_ID_MXPEG,
338 .priv_data_size = sizeof(MXpegDecodeContext),
339 .init = mxpeg_decode_init,
340 .close = mxpeg_decode_end,
341 .decode = mxpeg_decode_frame,
342 .capabilities = CODEC_CAP_DR1,