3 * Copyright (c) 2011 Anatoly Nenashev
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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_end(AVCodecContext *avctx)
47 MXpegDecodeContext *s = avctx->priv_data;
48 MJpegDecodeContext *jpg = &s->jpg;
51 jpg->picture_ptr = NULL;
52 ff_mjpeg_decode_end(avctx);
54 for (i = 0; i < 2; ++i)
55 av_frame_free(&s->picture[i]);
57 av_freep(&s->mxm_bitmask);
58 av_freep(&s->completion_bitmask);
63 static av_cold int mxpeg_decode_init(AVCodecContext *avctx)
65 MXpegDecodeContext *s = avctx->priv_data;
67 s->picture[0] = av_frame_alloc();
68 s->picture[1] = av_frame_alloc();
69 if (!s->picture[0] || !s->picture[1]) {
70 mxpeg_decode_end(avctx);
71 return AVERROR(ENOMEM);
74 s->jpg.picture_ptr = s->picture[0];
75 return ff_mjpeg_decode_init(avctx);
78 static int mxpeg_decode_app(MXpegDecodeContext *s,
79 const uint8_t *buf_ptr, int buf_size)
84 len = AV_RB16(buf_ptr);
85 skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
90 static int mxpeg_decode_mxm(MXpegDecodeContext *s,
91 const uint8_t *buf_ptr, int buf_size)
93 unsigned bitmask_size, mb_count;
96 s->mb_width = AV_RL16(buf_ptr+4);
97 s->mb_height = AV_RL16(buf_ptr+6);
98 mb_count = s->mb_width * s->mb_height;
100 bitmask_size = (mb_count + 7) >> 3;
101 if (bitmask_size > buf_size - 12) {
102 av_log(s->jpg.avctx, AV_LOG_ERROR,
103 "MXM bitmask is not complete\n");
104 return AVERROR(EINVAL);
107 if (s->bitmask_size != bitmask_size) {
108 av_freep(&s->mxm_bitmask);
109 s->mxm_bitmask = av_malloc(bitmask_size);
110 if (!s->mxm_bitmask) {
111 av_log(s->jpg.avctx, AV_LOG_ERROR,
112 "MXM bitmask memory allocation error\n");
113 return AVERROR(ENOMEM);
116 av_freep(&s->completion_bitmask);
117 s->completion_bitmask = av_mallocz(bitmask_size);
118 if (!s->completion_bitmask) {
119 av_log(s->jpg.avctx, AV_LOG_ERROR,
120 "Completion bitmask memory allocation error\n");
121 return AVERROR(ENOMEM);
124 s->bitmask_size = bitmask_size;
127 memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size);
128 s->got_mxm_bitmask = 1;
130 if (!s->has_complete_frame) {
131 uint8_t completion_check = 0xFF;
132 for (i = 0; i < bitmask_size; ++i) {
133 s->completion_bitmask[i] |= s->mxm_bitmask[i];
134 completion_check &= s->completion_bitmask[i];
136 s->has_complete_frame = !(completion_check ^ 0xFF);
142 static int mxpeg_decode_com(MXpegDecodeContext *s,
143 const uint8_t *buf_ptr, int buf_size)
148 len = AV_RB16(buf_ptr);
149 if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) {
150 ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2);
152 skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size));
157 static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg,
158 AVFrame *reference_ptr)
160 if ((jpg->width + 0x0F)>>4 != s->mb_width ||
161 (jpg->height + 0x0F)>>4 != s->mb_height) {
162 av_log(jpg->avctx, AV_LOG_ERROR,
163 "Picture dimensions stored in SOF and MXM mismatch\n");
164 return AVERROR(EINVAL);
167 if (reference_ptr->data[0]) {
169 for (i = 0; i < MAX_COMPONENTS; ++i) {
170 if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) ||
171 reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) {
172 av_log(jpg->avctx, AV_LOG_ERROR,
173 "Dimensions of current and reference picture mismatch\n");
174 return AVERROR(EINVAL);
182 static int mxpeg_decode_frame(AVCodecContext *avctx,
183 void *data, int *got_frame,
186 const uint8_t *buf = avpkt->data;
187 int buf_size = avpkt->size;
188 MXpegDecodeContext *s = avctx->priv_data;
189 MJpegDecodeContext *jpg = &s->jpg;
190 const uint8_t *buf_end, *buf_ptr;
191 const uint8_t *unescaped_buf_ptr;
192 int unescaped_buf_size;
197 buf_end = buf + buf_size;
198 jpg->got_picture = 0;
199 s->got_mxm_bitmask = 0;
200 while (buf_ptr < buf_end) {
201 start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end,
202 &unescaped_buf_ptr, &unescaped_buf_size);
206 init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8);
208 if (start_code >= APP0 && start_code <= APP15) {
209 mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size);
212 switch (start_code) {
214 if (jpg->got_picture) //emulating EOI
220 ret = ff_mjpeg_decode_dqt(jpg);
222 av_log(avctx, AV_LOG_ERROR,
223 "quantization table decode error\n");
228 ret = ff_mjpeg_decode_dht(jpg);
230 av_log(avctx, AV_LOG_ERROR,
231 "huffman table decode error\n");
236 ret = mxpeg_decode_com(s, unescaped_buf_ptr,
243 ret = ff_mjpeg_decode_sof(jpg);
245 av_log(avctx, AV_LOG_ERROR,
246 "SOF data decode error\n");
249 if (jpg->interlaced) {
250 av_log(avctx, AV_LOG_ERROR,
251 "Interlaced mode not supported in MxPEG\n");
252 return AVERROR(EINVAL);
257 if (!s->got_sof_data) {
258 av_log(avctx, AV_LOG_WARNING,
259 "Can not process SOS without SOF data, skipping\n");
262 if (!jpg->got_picture) {
263 if (jpg->first_picture) {
264 av_log(avctx, AV_LOG_WARNING,
265 "First picture has no SOF, skipping\n");
268 if (!s->got_mxm_bitmask){
269 av_log(avctx, AV_LOG_WARNING,
270 "Non-key frame has no MXM, skipping\n");
273 /* use stored SOF data to allocate current picture */
274 av_frame_unref(jpg->picture_ptr);
275 if (ff_get_buffer(avctx, jpg->picture_ptr,
276 AV_GET_BUFFER_FLAG_REF) < 0) {
277 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
278 return AVERROR(ENOMEM);
280 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
281 jpg->picture_ptr->key_frame = 0;
282 jpg->got_picture = 1;
284 jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_I;
285 jpg->picture_ptr->key_frame = 1;
288 if (s->got_mxm_bitmask) {
289 AVFrame *reference_ptr = s->picture[s->picture_index ^ 1];
290 if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0)
293 /* allocate dummy reference picture if needed */
294 if (!reference_ptr->data[0] &&
295 ff_get_buffer(avctx, reference_ptr,
296 AV_GET_BUFFER_FLAG_REF) < 0) {
297 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
298 return AVERROR(ENOMEM);
301 ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, reference_ptr);
302 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
305 ret = ff_mjpeg_decode_sos(jpg, NULL, NULL);
306 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
313 buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3;
319 if (jpg->got_picture) {
320 int ret = av_frame_ref(data, jpg->picture_ptr);
325 s->picture_index ^= 1;
326 jpg->picture_ptr = s->picture[s->picture_index];
328 if (!s->has_complete_frame) {
329 if (!s->got_mxm_bitmask)
330 s->has_complete_frame = 1;
336 return buf_ptr - buf;
339 AVCodec ff_mxpeg_decoder = {
341 .long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
342 .type = AVMEDIA_TYPE_VIDEO,
343 .id = AV_CODEC_ID_MXPEG,
344 .priv_data_size = sizeof(MXpegDecodeContext),
345 .init = mxpeg_decode_init,
346 .close = mxpeg_decode_end,
347 .decode = mxpeg_decode_frame,
348 .capabilities = CODEC_CAP_DR1,