mirror of https://github.com/FFmpeg/FFmpeg.git
anatoly
14 years ago
committed by
Anton Khirnov
parent
e0e3b8b297
commit
ce02f9becf
6 changed files with 345 additions and 1 deletions
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/*
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* MxPEG decoder |
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* Copyright (c) 2011 Anatoly Nenashev |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* MxPEG decoder |
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*/ |
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#include "mjpeg.h" |
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#include "mjpegdec.h" |
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typedef struct MXpegDecodeContext { |
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MJpegDecodeContext jpg; |
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AVFrame picture[2]; /* pictures array */ |
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int picture_index; /* index of current picture */ |
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int got_sof_data; /* true if SOF data successfully parsed */ |
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int got_mxm_bitmask; /* true if MXM bitmask available */ |
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uint8_t *mxm_bitmask; /* bitmask buffer */ |
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unsigned bitmask_size; /* size of bitmask */ |
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int has_complete_frame; /* true if has complete frame */ |
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uint8_t *completion_bitmask; /* completion bitmask of macroblocks */ |
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unsigned mb_width, mb_height; /* size of picture in MB's from MXM header */ |
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} MXpegDecodeContext; |
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static av_cold int mxpeg_decode_init(AVCodecContext *avctx) |
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{ |
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MXpegDecodeContext *s = avctx->priv_data; |
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s->picture[0].reference = s->picture[1].reference = 3; |
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s->jpg.picture_ptr = &s->picture[0]; |
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ff_mjpeg_decode_init(avctx); |
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return 0; |
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} |
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static int mxpeg_decode_app(MXpegDecodeContext *s, |
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const uint8_t *buf_ptr, int buf_size) |
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{ |
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int len; |
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if (buf_size < 2) |
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return 0; |
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len = AV_RB16(buf_ptr); |
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skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); |
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return 0; |
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} |
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static int mxpeg_decode_mxm(MXpegDecodeContext *s, |
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const uint8_t *buf_ptr, int buf_size) |
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{ |
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unsigned bitmask_size, mb_count; |
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int i; |
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s->mb_width = AV_RL16(buf_ptr+4); |
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s->mb_height = AV_RL16(buf_ptr+6); |
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mb_count = s->mb_width * s->mb_height; |
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bitmask_size = (mb_count + 7) >> 3; |
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if (bitmask_size > buf_size - 12) { |
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av_log(s->jpg.avctx, AV_LOG_ERROR, |
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"MXM bitmask is not complete\n"); |
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return AVERROR(EINVAL); |
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} |
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if (s->bitmask_size != bitmask_size) { |
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av_freep(&s->mxm_bitmask); |
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s->mxm_bitmask = av_malloc(bitmask_size); |
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if (!s->mxm_bitmask) { |
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av_log(s->jpg.avctx, AV_LOG_ERROR, |
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"MXM bitmask memory allocation error\n"); |
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return AVERROR(ENOMEM); |
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} |
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av_freep(&s->completion_bitmask); |
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s->completion_bitmask = av_mallocz(bitmask_size); |
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if (!s->completion_bitmask) { |
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av_log(s->jpg.avctx, AV_LOG_ERROR, |
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"Completion bitmask memory allocation error\n"); |
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return AVERROR(ENOMEM); |
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} |
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s->bitmask_size = bitmask_size; |
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} |
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memcpy(s->mxm_bitmask, buf_ptr + 12, bitmask_size); |
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s->got_mxm_bitmask = 1; |
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if (!s->has_complete_frame) { |
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uint8_t completion_check = 0xFF; |
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for (i = 0; i < bitmask_size; ++i) { |
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s->completion_bitmask[i] |= s->mxm_bitmask[i]; |
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completion_check &= s->completion_bitmask[i]; |
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} |
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s->has_complete_frame = !(completion_check ^ 0xFF); |
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} |
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return 0; |
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} |
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static int mxpeg_decode_com(MXpegDecodeContext *s, |
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const uint8_t *buf_ptr, int buf_size) |
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{ |
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int len, ret = 0; |
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if (buf_size < 2) |
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return 0; |
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len = AV_RB16(buf_ptr); |
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if (len > 14 && len <= buf_size && !strncmp(buf_ptr + 2, "MXM", 3)) { |
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ret = mxpeg_decode_mxm(s, buf_ptr + 2, len - 2); |
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} |
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skip_bits(&s->jpg.gb, 8*FFMIN(len,buf_size)); |
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return ret; |
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} |
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static int mxpeg_check_dimensions(MXpegDecodeContext *s, MJpegDecodeContext *jpg, |
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AVFrame *reference_ptr) |
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{ |
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if ((jpg->width + 0x0F)>>4 != s->mb_width || |
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(jpg->height + 0x0F)>>4 != s->mb_height) { |
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av_log(jpg->avctx, AV_LOG_ERROR, |
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"Picture dimensions stored in SOF and MXM mismatch\n"); |
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return AVERROR(EINVAL); |
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} |
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if (reference_ptr->data[0]) { |
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int i; |
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for (i = 0; i < MAX_COMPONENTS; ++i) { |
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if ( (!reference_ptr->data[i] ^ !jpg->picture_ptr->data[i]) || |
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reference_ptr->linesize[i] != jpg->picture_ptr->linesize[i]) { |
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av_log(jpg->avctx, AV_LOG_ERROR, |
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"Dimensions of current and reference picture mismatch\n"); |
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return AVERROR(EINVAL); |
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} |
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} |
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} |
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return 0; |
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} |
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static int mxpeg_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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MXpegDecodeContext *s = avctx->priv_data; |
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MJpegDecodeContext *jpg = &s->jpg; |
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const uint8_t *buf_end, *buf_ptr; |
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const uint8_t *unescaped_buf_ptr; |
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int unescaped_buf_size; |
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int start_code; |
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AVFrame *picture = data; |
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int ret; |
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buf_ptr = buf; |
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buf_end = buf + buf_size; |
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jpg->got_picture = 0; |
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s->got_mxm_bitmask = 0; |
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while (buf_ptr < buf_end) { |
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start_code = ff_mjpeg_find_marker(jpg, &buf_ptr, buf_end, |
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&unescaped_buf_ptr, &unescaped_buf_size); |
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if (start_code < 0) |
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goto the_end; |
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{ |
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init_get_bits(&jpg->gb, unescaped_buf_ptr, unescaped_buf_size*8); |
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if (start_code >= APP0 && start_code <= APP15) { |
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mxpeg_decode_app(s, unescaped_buf_ptr, unescaped_buf_size); |
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} |
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switch (start_code) { |
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case SOI: |
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if (jpg->got_picture) //emulating EOI
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goto the_end; |
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break; |
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case EOI: |
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goto the_end; |
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case DQT: |
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ret = ff_mjpeg_decode_dqt(jpg); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, |
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"quantization table decode error\n"); |
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return ret; |
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} |
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break; |
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case DHT: |
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ret = ff_mjpeg_decode_dht(jpg); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, |
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"huffman table decode error\n"); |
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return ret; |
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} |
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break; |
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case COM: |
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ret = mxpeg_decode_com(s, unescaped_buf_ptr, |
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unescaped_buf_size); |
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if (ret < 0) |
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return ret; |
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break; |
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case SOF0: |
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s->got_sof_data = 0; |
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ret = ff_mjpeg_decode_sof(jpg); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, |
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"SOF data decode error\n"); |
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return ret; |
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} |
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if (jpg->interlaced) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Interlaced mode not supported in MxPEG\n"); |
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return AVERROR(EINVAL); |
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} |
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s->got_sof_data = 1; |
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break; |
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case SOS: |
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if (!s->got_sof_data) { |
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av_log(avctx, AV_LOG_WARNING, |
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"Can not process SOS without SOF data, skipping\n"); |
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break; |
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} |
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if (!jpg->got_picture) { |
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if (jpg->first_picture) { |
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av_log(avctx, AV_LOG_WARNING, |
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"First picture has no SOF, skipping\n"); |
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break; |
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} |
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if (!s->got_mxm_bitmask){ |
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av_log(avctx, AV_LOG_WARNING, |
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"Non-key frame has no MXM, skipping\n"); |
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break; |
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} |
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/* use stored SOF data to allocate current picture */ |
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if (jpg->picture_ptr->data[0]) |
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avctx->release_buffer(avctx, jpg->picture_ptr); |
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if (avctx->get_buffer(avctx, jpg->picture_ptr) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return AVERROR(ENOMEM); |
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} |
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jpg->picture_ptr->pict_type = FF_P_TYPE; |
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jpg->picture_ptr->key_frame = 0; |
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jpg->got_picture = 1; |
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} else { |
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jpg->picture_ptr->pict_type = FF_I_TYPE; |
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jpg->picture_ptr->key_frame = 1; |
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} |
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if (s->got_mxm_bitmask) { |
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AVFrame *reference_ptr = &s->picture[s->picture_index ^ 1]; |
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if (mxpeg_check_dimensions(s, jpg, reference_ptr) < 0) |
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break; |
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/* allocate dummy reference picture if needed */ |
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if (!reference_ptr->data[0] && |
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avctx->get_buffer(avctx, reference_ptr) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return AVERROR(ENOMEM); |
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} |
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ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, reference_ptr); |
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} else { |
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ff_mjpeg_decode_sos(jpg, NULL, NULL); |
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} |
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break; |
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} |
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buf_ptr += (get_bits_count(&jpg->gb)+7) >> 3; |
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} |
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} |
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the_end: |
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if (jpg->got_picture) { |
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*data_size = sizeof(AVFrame); |
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*picture = *jpg->picture_ptr; |
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s->picture_index ^= 1; |
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jpg->picture_ptr = &s->picture[s->picture_index]; |
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if (!s->has_complete_frame) { |
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if (!s->got_mxm_bitmask) |
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s->has_complete_frame = 1; |
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else |
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*data_size = 0; |
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} |
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} |
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return buf_ptr - buf; |
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} |
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static av_cold int mxpeg_decode_end(AVCodecContext *avctx) |
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{ |
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MXpegDecodeContext *s = avctx->priv_data; |
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MJpegDecodeContext *jpg = &s->jpg; |
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int i; |
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jpg->picture_ptr = NULL; |
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ff_mjpeg_decode_end(avctx); |
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for (i = 0; i < 2; ++i) { |
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if (s->picture[i].data[0]) |
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avctx->release_buffer(avctx, &s->picture[i]); |
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} |
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av_freep(&s->mxm_bitmask); |
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av_freep(&s->completion_bitmask); |
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return 0; |
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} |
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AVCodec ff_mxpeg_decoder = { |
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.name = "mxpeg", |
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.long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_MXPEG, |
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.priv_data_size = sizeof(MXpegDecodeContext), |
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.init = mxpeg_decode_init, |
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.close = mxpeg_decode_end, |
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.decode = mxpeg_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.max_lowres = 3 |
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}; |
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