| /* | |
| * 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 "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, | |
| }; |