forked from KolibriOS/kolibrios
248 lines
6.8 KiB
C
248 lines
6.8 KiB
C
/*
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* RAW demuxers
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* Copyright (c) 2001 Fabrice Bellard
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* Copyright (c) 2005 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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#include "avformat.h"
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#include "internal.h"
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#include "avio_internal.h"
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#include "rawdec.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/avassert.h"
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#include "libavutil/intreadwrite.h"
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#define RAW_PACKET_SIZE 1024
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int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size;
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size = RAW_PACKET_SIZE;
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if (av_new_packet(pkt, size) < 0)
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return AVERROR(ENOMEM);
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pkt->pos= avio_tell(s->pb);
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pkt->stream_index = 0;
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ret = ffio_read_partial(s->pb, pkt->data, size);
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if (ret < 0) {
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av_free_packet(pkt);
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return ret;
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}
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av_shrink_packet(pkt, ret);
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return ret;
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}
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int ff_raw_audio_read_header(AVFormatContext *s)
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{
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = s->iformat->raw_codec_id;
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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st->start_time = 0;
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/* the parameters will be extracted from the compressed bitstream */
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return 0;
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}
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/* MPEG-1/H.263 input */
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int ff_raw_video_read_header(AVFormatContext *s)
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{
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AVStream *st;
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FFRawVideoDemuxerContext *s1 = s->priv_data;
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int ret = 0;
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st = avformat_new_stream(s, NULL);
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if (!st) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = s->iformat->raw_codec_id;
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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st->codec->framerate = s1->framerate;
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st->codec->time_base = av_inv_q(s1->framerate);
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avpriv_set_pts_info(st, 64, 1, 1200000);
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fail:
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return ret;
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}
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int ff_raw_data_read_header(AVFormatContext *s)
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{
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_DATA;
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st->codec->codec_id = s->iformat->raw_codec_id;
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st->start_time = 0;
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return 0;
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}
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/* Note: Do not forget to add new entries to the Makefile as well. */
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#define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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const AVOption ff_rawvideo_options[] = {
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{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC},
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{ NULL },
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};
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#if CONFIG_DATA_DEMUXER
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AVInputFormat ff_data_demuxer = {
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.name = "data",
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.long_name = NULL_IF_CONFIG_SMALL("raw data"),
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.read_header = ff_raw_data_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.raw_codec_id = AV_CODEC_ID_NONE,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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#endif
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#if CONFIG_LATM_DEMUXER
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AVInputFormat ff_latm_demuxer = {
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.name = "latm",
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.long_name = NULL_IF_CONFIG_SMALL("raw LOAS/LATM"),
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.read_header = ff_raw_audio_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
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.extensions = "latm",
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.raw_codec_id = AV_CODEC_ID_AAC_LATM,
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};
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#endif
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#if CONFIG_MJPEG_DEMUXER
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static int mjpeg_probe(AVProbeData *p)
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{
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int i;
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int state = -1;
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int nb_invalid = 0;
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int nb_frames = 0;
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for (i=0; i<p->buf_size-2; i++) {
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int c;
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if (p->buf[i] != 0xFF)
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continue;
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c = p->buf[i+1];
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switch (c) {
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case 0xD8:
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state = 0xD8;
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break;
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case 0xC0:
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case 0xC1:
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case 0xC2:
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case 0xC3:
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case 0xC5:
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case 0xC6:
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case 0xC7:
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case 0xF7:
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if (state == 0xD8) {
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state = 0xC0;
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} else
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nb_invalid++;
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break;
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case 0xDA:
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if (state == 0xC0) {
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state = 0xDA;
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} else
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nb_invalid++;
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break;
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case 0xD9:
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if (state == 0xDA) {
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state = 0xD9;
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nb_frames++;
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} else
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nb_invalid++;
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break;
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default:
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if ( (c >= 0x02 && c <= 0xBF)
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|| c == 0xC8) {
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nb_invalid++;
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}
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}
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}
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if (nb_invalid*4 + 1 < nb_frames) {
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static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
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int i;
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for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
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if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
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return AVPROBE_SCORE_EXTENSION;
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if (nb_invalid == 0 && nb_frames > 2)
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return AVPROBE_SCORE_EXTENSION / 2;
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return AVPROBE_SCORE_EXTENSION / 4;
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}
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return 0;
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}
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FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
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#endif
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#if CONFIG_MLP_DEMUXER
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AVInputFormat ff_mlp_demuxer = {
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.name = "mlp",
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.long_name = NULL_IF_CONFIG_SMALL("raw MLP"),
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.read_header = ff_raw_audio_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
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.extensions = "mlp",
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.raw_codec_id = AV_CODEC_ID_MLP,
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};
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#endif
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#if CONFIG_TRUEHD_DEMUXER
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AVInputFormat ff_truehd_demuxer = {
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.name = "truehd",
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.long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"),
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.read_header = ff_raw_audio_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
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.extensions = "thd",
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.raw_codec_id = AV_CODEC_ID_TRUEHD,
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};
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#endif
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#if CONFIG_SHORTEN_DEMUXER
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AVInputFormat ff_shorten_demuxer = {
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.name = "shn",
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.long_name = NULL_IF_CONFIG_SMALL("raw Shorten"),
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.read_header = ff_raw_audio_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK|AVFMT_NOTIMESTAMPS,
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.extensions = "shn",
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.raw_codec_id = AV_CODEC_ID_SHORTEN,
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};
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#endif
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#if CONFIG_VC1_DEMUXER
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FF_DEF_RAWVIDEO_DEMUXER2(vc1, "raw VC-1", NULL, "vc1", AV_CODEC_ID_VC1, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
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#endif
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