2007-05-19 17:58:31 +03:00
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/*
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* Apple MJPEG-B decoder
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* Copyright (c) 2002 Alex Beregszaszi
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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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2010-04-20 17:45:34 +03:00
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* @file
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2007-05-19 17:58:31 +03:00
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* Apple MJPEG-B decoder.
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*/
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#include "avcodec.h"
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#include "mjpeg.h"
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#include "mjpegdec.h"
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2009-05-30 13:04:09 +03:00
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static uint32_t read_offs(AVCodecContext *avctx, GetBitContext *gb, uint32_t size, const char *err_msg){
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uint32_t offs= get_bits_long(gb, 32);
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if(offs >= size){
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av_log(avctx, AV_LOG_WARNING, err_msg, offs, size);
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return 0;
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}
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return offs;
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}
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2007-05-19 17:58:31 +03:00
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static int mjpegb_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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2009-04-07 18:59:50 +03:00
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AVPacket *avpkt)
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2007-05-19 17:58:31 +03:00
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{
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2009-04-07 18:59:50 +03:00
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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2007-05-19 17:58:31 +03:00
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MJpegDecodeContext *s = avctx->priv_data;
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2008-02-01 17:30:29 +02:00
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const uint8_t *buf_end, *buf_ptr;
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2007-05-19 17:58:31 +03:00
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AVFrame *picture = data;
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GetBitContext hgb; /* for the header */
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uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
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uint32_t field_size, sod_offs;
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buf_ptr = buf;
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buf_end = buf + buf_size;
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2012-04-22 15:19:18 +03:00
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s->got_picture = 0;
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2007-05-19 17:58:31 +03:00
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read_header:
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/* reset on every SOI */
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s->restart_interval = 0;
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s->restart_count = 0;
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s->mjpb_skiptosod = 0;
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2012-01-26 00:39:24 +03:00
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if (buf_end - buf_ptr >= 1 << 28)
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return AVERROR_INVALIDDATA;
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2007-05-19 17:58:31 +03:00
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init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
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skip_bits(&hgb, 32); /* reserved zeros */
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if (get_bits_long(&hgb, 32) != MKBETAG('m','j','p','g'))
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{
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av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");
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2012-02-18 03:27:36 +03:00
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return AVERROR_INVALIDDATA;
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2007-05-19 17:58:31 +03:00
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}
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field_size = get_bits_long(&hgb, 32); /* field size */
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av_log(avctx, AV_LOG_DEBUG, "field size: 0x%x\n", field_size);
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skip_bits(&hgb, 32); /* padded field size */
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2009-05-30 13:04:09 +03:00
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second_field_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "second_field_offs is %d and size is %d\n");
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2007-05-19 17:58:31 +03:00
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av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%x\n", second_field_offs);
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2009-05-30 13:04:09 +03:00
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dqt_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "dqt is %d and size is %d\n");
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2007-05-19 17:58:31 +03:00
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av_log(avctx, AV_LOG_DEBUG, "dqt offs: 0x%x\n", dqt_offs);
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if (dqt_offs)
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{
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2007-08-01 16:18:23 +03:00
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init_get_bits(&s->gb, buf_ptr+dqt_offs, (buf_end - (buf_ptr+dqt_offs))*8);
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2007-05-19 17:58:31 +03:00
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s->start_code = DQT;
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2011-08-11 18:16:09 +03:00
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if (ff_mjpeg_decode_dqt(s) < 0 &&
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2011-10-22 15:44:16 +03:00
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(avctx->err_recognition & AV_EF_EXPLODE))
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2011-08-11 18:16:09 +03:00
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return AVERROR_INVALIDDATA;
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2007-05-19 17:58:31 +03:00
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}
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2009-05-30 13:04:09 +03:00
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dht_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "dht is %d and size is %d\n");
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2007-05-19 17:58:31 +03:00
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av_log(avctx, AV_LOG_DEBUG, "dht offs: 0x%x\n", dht_offs);
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if (dht_offs)
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{
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2007-08-01 16:18:23 +03:00
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init_get_bits(&s->gb, buf_ptr+dht_offs, (buf_end - (buf_ptr+dht_offs))*8);
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2007-05-19 17:58:31 +03:00
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s->start_code = DHT;
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ff_mjpeg_decode_dht(s);
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}
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2009-05-30 13:04:09 +03:00
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sof_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sof is %d and size is %d\n");
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2007-05-19 17:58:31 +03:00
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av_log(avctx, AV_LOG_DEBUG, "sof offs: 0x%x\n", sof_offs);
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if (sof_offs)
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{
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2007-08-01 16:18:23 +03:00
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init_get_bits(&s->gb, buf_ptr+sof_offs, (buf_end - (buf_ptr+sof_offs))*8);
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2007-05-19 17:58:31 +03:00
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s->start_code = SOF0;
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if (ff_mjpeg_decode_sof(s) < 0)
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return -1;
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}
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2009-05-30 13:04:09 +03:00
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sos_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sos is %d and size is %d\n");
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2007-05-19 17:58:31 +03:00
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av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%x\n", sos_offs);
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2009-05-30 13:04:09 +03:00
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sod_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sof is %d and size is %d\n");
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2007-05-19 17:58:31 +03:00
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av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%x\n", sod_offs);
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if (sos_offs)
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{
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2012-01-26 00:39:24 +03:00
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init_get_bits(&s->gb, buf_ptr + sos_offs,
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8 * FFMIN(field_size, buf_end - buf_ptr - sos_offs));
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2007-05-19 17:58:31 +03:00
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s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
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s->start_code = SOS;
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2011-08-11 18:16:09 +03:00
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if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
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2011-10-22 15:44:16 +03:00
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(avctx->err_recognition & AV_EF_EXPLODE))
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2011-08-11 18:16:09 +03:00
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return AVERROR_INVALIDDATA;
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2007-05-19 17:58:31 +03:00
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}
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if (s->interlaced) {
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s->bottom_field ^= 1;
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/* if not bottom field, do not output image yet */
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2007-12-05 13:36:06 +02:00
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if (s->bottom_field != s->interlace_polarity && second_field_offs)
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2007-05-19 17:58:31 +03:00
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{
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buf_ptr = buf + second_field_offs;
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goto read_header;
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}
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}
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//XXX FIXME factorize, this looks very similar to the EOI code
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2011-03-27 23:16:25 +03:00
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*picture= *s->picture_ptr;
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2007-05-19 17:58:31 +03:00
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*data_size = sizeof(AVFrame);
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if(!s->lossless){
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2008-04-19 20:07:58 +03:00
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picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
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2007-05-19 17:58:31 +03:00
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picture->qstride= 0;
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picture->qscale_table= s->qscale_table;
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memset(picture->qscale_table, picture->quality, (s->width+15)/16);
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if(avctx->debug & FF_DEBUG_QP)
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av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
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picture->quality*= FF_QP2LAMBDA;
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}
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2012-02-18 03:27:36 +03:00
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return buf_size;
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2007-05-19 17:58:31 +03:00
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}
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2011-01-25 23:40:11 +02:00
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AVCodec ff_mjpegb_decoder = {
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2011-07-17 13:54:31 +03:00
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.name = "mjpegb",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_MJPEGB,
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.priv_data_size = sizeof(MJpegDecodeContext),
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.init = ff_mjpeg_decode_init,
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.close = ff_mjpeg_decode_end,
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.decode = mjpegb_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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2012-04-22 22:37:54 +03:00
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.max_lowres = 3,
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2012-04-06 19:19:39 +03:00
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.long_name = NULL_IF_CONFIG_SMALL("Apple MJPEG-B"),
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2007-05-19 17:58:31 +03:00
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};
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