/libavformat/rawdec.c
http://github.com/FFmpeg/FFmpeg · C · 214 lines · 163 code · 27 blank · 24 comment · 26 complexity · 940d3c7c69bc86661c0b045e692f6566 MD5 · raw file
- /*
- * RAW demuxers
- * Copyright (c) 2001 Fabrice Bellard
- * Copyright (c) 2005 Alex Beregszaszi
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #include "avformat.h"
- #include "internal.h"
- #include "avio_internal.h"
- #include "rawdec.h"
- #include "libavutil/opt.h"
- #include "libavutil/parseutils.h"
- #include "libavutil/pixdesc.h"
- #include "libavutil/avassert.h"
- #include "libavutil/intreadwrite.h"
- #define RAW_PACKET_SIZE 1024
- int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
- {
- FFRawDemuxerContext *raw = s->priv_data;
- int ret, size;
- size = raw->raw_packet_size;
- if ((ret = av_new_packet(pkt, size)) < 0)
- return ret;
- pkt->pos= avio_tell(s->pb);
- pkt->stream_index = 0;
- ret = avio_read_partial(s->pb, pkt->data, size);
- if (ret < 0) {
- av_packet_unref(pkt);
- return ret;
- }
- av_shrink_packet(pkt, ret);
- return ret;
- }
- int ff_raw_audio_read_header(AVFormatContext *s)
- {
- AVStream *st = avformat_new_stream(s, NULL);
- if (!st)
- return AVERROR(ENOMEM);
- st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codecpar->codec_id = s->iformat->raw_codec_id;
- st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
- st->start_time = 0;
- /* the parameters will be extracted from the compressed bitstream */
- return 0;
- }
- /* MPEG-1/H.263 input */
- int ff_raw_video_read_header(AVFormatContext *s)
- {
- AVStream *st;
- FFRawVideoDemuxerContext *s1 = s->priv_data;
- int ret = 0;
- st = avformat_new_stream(s, NULL);
- if (!st) {
- ret = AVERROR(ENOMEM);
- goto fail;
- }
- st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codecpar->codec_id = s->iformat->raw_codec_id;
- st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
- st->internal->avctx->framerate = s1->framerate;
- avpriv_set_pts_info(st, 64, 1, 1200000);
- fail:
- return ret;
- }
- int ff_raw_subtitle_read_header(AVFormatContext *s)
- {
- AVStream *st = avformat_new_stream(s, NULL);
- if (!st)
- return AVERROR(ENOMEM);
- st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
- st->codecpar->codec_id = s->iformat->raw_codec_id;
- st->start_time = 0;
- return 0;
- }
- int ff_raw_data_read_header(AVFormatContext *s)
- {
- AVStream *st = avformat_new_stream(s, NULL);
- if (!st)
- return AVERROR(ENOMEM);
- st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
- st->codecpar->codec_id = s->iformat->raw_codec_id;
- st->start_time = 0;
- return 0;
- }
- /* Note: Do not forget to add new entries to the Makefile as well. */
- #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
- #define DEC AV_OPT_FLAG_DECODING_PARAM
- const AVOption ff_rawvideo_options[] = {
- { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},
- { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
- { NULL },
- };
- const AVOption ff_raw_options[] = {
- { "raw_packet_size", "", OFFSET(raw_packet_size), AV_OPT_TYPE_INT, {.i64 = RAW_PACKET_SIZE }, 1, INT_MAX, DEC},
- { NULL },
- };
- #if CONFIG_DATA_DEMUXER
- FF_RAW_DEMUXER_CLASS(raw_data)
- AVInputFormat ff_data_demuxer = {
- .name = "data",
- .long_name = NULL_IF_CONFIG_SMALL("raw data"),
- .read_header = ff_raw_data_read_header,
- .read_packet = ff_raw_read_partial_packet,
- .raw_codec_id = AV_CODEC_ID_NONE,
- .flags = AVFMT_NOTIMESTAMPS,
- .priv_data_size = sizeof(FFRawDemuxerContext),\
- .priv_class = &raw_data_demuxer_class,\
- };
- #endif
- #if CONFIG_MJPEG_DEMUXER
- static int mjpeg_probe(const AVProbeData *p)
- {
- int i;
- int state = -1;
- int nb_invalid = 0;
- int nb_frames = 0;
- for (i = 0; i < p->buf_size - 1; i++) {
- int c;
- if (p->buf[i] != 0xFF)
- continue;
- c = p->buf[i+1];
- switch (c) {
- case 0xD8:
- state = 0xD8;
- break;
- case 0xC0:
- case 0xC1:
- case 0xC2:
- case 0xC3:
- case 0xC5:
- case 0xC6:
- case 0xC7:
- case 0xF7:
- if (state == 0xD8) {
- state = 0xC0;
- } else
- nb_invalid++;
- break;
- case 0xDA:
- if (state == 0xC0) {
- state = 0xDA;
- } else
- nb_invalid++;
- break;
- case 0xD9:
- if (state == 0xDA) {
- state = 0xD9;
- nb_frames++;
- } else
- nb_invalid++;
- break;
- default:
- if ( (c >= 0x02 && c <= 0xBF)
- || c == 0xC8) {
- nb_invalid++;
- }
- }
- }
- if (nb_invalid*4 + 1 < nb_frames) {
- static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";
- int i;
- for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)
- if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
- return AVPROBE_SCORE_EXTENSION;
- if (nb_invalid == 0 && nb_frames > 2)
- return AVPROBE_SCORE_EXTENSION / 2;
- return AVPROBE_SCORE_EXTENSION / 4;
- }
- return 0;
- }
- FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)
- #endif