mirror of
https://git.videolan.org/git/ffmpeg.git
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219 lines
6.3 KiB
C
219 lines
6.3 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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/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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} else if (ret < size) {
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/* initialize end of packet for partial reads to avoid reading
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* uninitialized data on allowed overreads */
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memset(pkt->data + ret, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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}
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pkt->size = 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;
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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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AVRational framerate;
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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;
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if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
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av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
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goto fail;
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}
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st->avg_frame_rate = framerate;
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avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
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fail:
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return ret;
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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_STRING, {.str = "25"}, 0, 0, DEC},
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{ NULL },
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};
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#if CONFIG_LATM_DEMUXER
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#define LOAS_SYNC_WORD 0x2b7
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static int latm_read_probe(AVProbeData *p)
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{
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int max_frames = 0, first_frames = 0;
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int fsize, frames;
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uint8_t *buf0 = p->buf;
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uint8_t *buf2;
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uint8_t *buf;
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uint8_t *end = buf0 + p->buf_size - 3;
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buf = buf0;
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for (; buf < end; buf = buf2 + 1) {
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buf2 = buf;
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for (frames = 0; buf2 < end; frames++) {
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uint32_t header = AV_RB24(buf2);
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if ((header >> 13) != LOAS_SYNC_WORD) {
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if (buf != buf0) {
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// Found something that isn't a LOAS header, starting
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// from a position other than the start of the buffer.
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// Discard the count we've accumulated so far since it
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// probably was a false positive.
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frames = 0;
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}
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break;
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}
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fsize = (header & 0x1FFF) + 3;
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if (fsize < 7)
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break;
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buf2 += fsize;
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}
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max_frames = FFMAX(max_frames, frames);
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if (buf == buf0)
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first_frames = frames;
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}
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if (first_frames >= 3)
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return AVPROBE_SCORE_EXTENSION + 1;
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else if (max_frames > 100)
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return AVPROBE_SCORE_EXTENSION;
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else if (max_frames >= 3)
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return AVPROBE_SCORE_EXTENSION / 2;
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else if (max_frames > 1)
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return 1;
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else
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return 0;
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}
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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_probe = latm_read_probe,
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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,
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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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FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg", AV_CODEC_ID_MJPEG)
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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,
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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,
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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,
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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_DEMUXER(vc1, "raw VC-1", NULL, "vc1", AV_CODEC_ID_VC1)
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#endif
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