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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
358 lines
12 KiB
C
358 lines
12 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 "codec_internal.h"
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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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return AVERROR(ENOMEM);
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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, AVFrame *rframe,
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int *got_frame, 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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if (avctx->skip_frame == AVDISCARD_ALL)
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return AVERROR_PATCHWELCOME;
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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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s->got_sof_data = !!s->got_sof_data;
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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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if (s->got_sof_data > 1) {
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av_log(avctx, AV_LOG_ERROR,
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"Multiple SOF in a frame\n");
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return AVERROR_INVALIDDATA;
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}
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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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s->got_sof_data = 0;
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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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s->got_sof_data = 0;
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return AVERROR(EINVAL);
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}
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s->got_sof_data ++;
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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(rframe, 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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const FFCodec ff_mxpeg_decoder = {
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.p.name = "mxpeg",
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.p.long_name = NULL_IF_CONFIG_SMALL("Mobotix MxPEG video"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.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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FF_CODEC_DECODE_CB(mxpeg_decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.p.max_lowres = 3,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
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};
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