mirror of
https://github.com/FFmpeg/FFmpeg.git
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349 lines
11 KiB
C
349 lines
11 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "internal.h"
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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_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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av_frame_free(&s->picture[i]);
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s->bitmask_size = 0;
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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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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] = av_frame_alloc();
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s->picture[1] = av_frame_alloc();
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if (!s->picture[0] || !s->picture[1]) {
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mxpeg_decode_end(avctx);
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return AVERROR(ENOMEM);
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}
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s->jpg.picture_ptr = s->picture[0];
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return ff_mjpeg_decode_init(avctx);
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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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s->bitmask_size = 0;
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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 *got_frame,
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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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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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av_frame_unref(jpg->picture_ptr);
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if ((ret = ff_get_buffer(avctx, jpg->picture_ptr,
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AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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jpg->picture_ptr->pict_type = AV_PICTURE_TYPE_P;
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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 = AV_PICTURE_TYPE_I;
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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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(ret = ff_get_buffer(avctx, reference_ptr,
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AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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ret = ff_mjpeg_decode_sos(jpg, s->mxm_bitmask, s->bitmask_size, reference_ptr);
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if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
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return ret;
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} else {
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ret = ff_mjpeg_decode_sos(jpg, NULL, 0, NULL);
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if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
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return ret;
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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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int ret = av_frame_ref(data, jpg->picture_ptr);
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if (ret < 0)
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return ret;
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*got_frame = 1;
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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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*got_frame = 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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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 = AV_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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