libavformat/rawdec.c

Go to the documentation of this 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"

/* raw input */
int ff_raw_read_header(AVFormatContext *s)
{
    AVStream *st;
    enum AVCodecID id;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

        id = s->iformat->raw_codec_id;
        if (id == AV_CODEC_ID_RAWVIDEO) {
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
        } else {
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
        }
        st->codec->codec_id = id;

        switch(st->codec->codec_type) {
        case AVMEDIA_TYPE_AUDIO: {
            RawAudioDemuxerContext *s1 = s->priv_data;

            st->codec->channels = 1;

            if (id == AV_CODEC_ID_ADPCM_G722)
                st->codec->sample_rate = 16000;

            if (s1 && s1->sample_rate)
                st->codec->sample_rate = s1->sample_rate;
            if (st->codec->sample_rate <= 0) {
                av_log(s, AV_LOG_WARNING, "Invalid sample rate %d specified using default of 44100\n",
                       st->codec->sample_rate);
                st->codec->sample_rate= 44100;
            }

            if (s1 && s1->channels)
                st->codec->channels    = s1->channels;

            st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
            av_assert0(st->codec->bits_per_coded_sample > 0);
            st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;
            avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
            break;
            }
        case AVMEDIA_TYPE_VIDEO: {
            FFRawVideoDemuxerContext *s1 = s->priv_data;
            int width = 0, height = 0, ret = 0;
            enum PixelFormat pix_fmt;
            AVRational framerate;

            if (s1->video_size && (ret = av_parse_video_size(&width, &height, s1->video_size)) < 0) {
                av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
                goto fail;
            }
            if ((pix_fmt = av_get_pix_fmt(s1->pixel_format)) == PIX_FMT_NONE) {
                av_log(s, AV_LOG_ERROR, "No such pixel format: %s.\n", s1->pixel_format);
                ret = AVERROR(EINVAL);
                goto fail;
            }
            if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
                av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
                goto fail;
            }
            avpriv_set_pts_info(st, 64, framerate.den, framerate.num);
            st->codec->width  = width;
            st->codec->height = height;
            st->codec->pix_fmt = pix_fmt;
fail:
            return ret;
            }
        default:
            return -1;
        }
    return 0;
}

#define RAW_PACKET_SIZE 1024

int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret, size;

    size = RAW_PACKET_SIZE;

    if (av_new_packet(pkt, size) < 0)
        return AVERROR(ENOMEM);

    pkt->pos= avio_tell(s->pb);
    pkt->stream_index = 0;
    ret = ffio_read_partial(s->pb, pkt->data, size);
    if (ret < 0) {
        av_free_packet(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->codec->codec_type = AVMEDIA_TYPE_AUDIO;
    st->codec->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;
    AVRational framerate;
    int ret = 0;


    st = avformat_new_stream(s, NULL);
    if (!st) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codec->codec_id = s->iformat->raw_codec_id;
    st->need_parsing = AVSTREAM_PARSE_FULL_RAW;

    if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
        av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
        goto fail;
    }

    st->codec->time_base = av_inv_q(framerate);
    avpriv_set_pts_info(st, 64, 1, 1200000);

fail:
    return ret;
}

/* 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_STRING, {.str = "25"}, 0, 0, DEC},
    { NULL },
};

#if CONFIG_G722_DEMUXER
AVInputFormat ff_g722_demuxer = {
    .name           = "g722",
    .long_name      = NULL_IF_CONFIG_SMALL("raw G.722"),
    .read_header    = ff_raw_read_header,
    .read_packet    = ff_raw_read_partial_packet,
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "g722,722",
    .raw_codec_id   = AV_CODEC_ID_ADPCM_G722,
};
#endif

#if CONFIG_LATM_DEMUXER
AVInputFormat ff_latm_demuxer = {
    .name           = "latm",
    .long_name      = NULL_IF_CONFIG_SMALL("raw LOAS/LATM"),
    .read_header    = ff_raw_audio_read_header,
    .read_packet    = ff_raw_read_partial_packet,
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "latm",
    .raw_codec_id   = AV_CODEC_ID_AAC_LATM,
};
#endif

#if CONFIG_MJPEG_DEMUXER
FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG)
#endif

#if CONFIG_MLP_DEMUXER
AVInputFormat ff_mlp_demuxer = {
    .name           = "mlp",
    .long_name      = NULL_IF_CONFIG_SMALL("raw MLP"),
    .read_header    = ff_raw_audio_read_header,
    .read_packet    = ff_raw_read_partial_packet,
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "mlp",
    .raw_codec_id   = AV_CODEC_ID_MLP,
};
#endif

#if CONFIG_TRUEHD_DEMUXER
AVInputFormat ff_truehd_demuxer = {
    .name           = "truehd",
    .long_name      = NULL_IF_CONFIG_SMALL("raw TrueHD"),
    .read_header    = ff_raw_audio_read_header,
    .read_packet    = ff_raw_read_partial_packet,
    .flags          = AVFMT_GENERIC_INDEX,
    .extensions     = "thd",
    .raw_codec_id   = AV_CODEC_ID_TRUEHD,
};
#endif

#if CONFIG_SHORTEN_DEMUXER
AVInputFormat ff_shorten_demuxer = {
    .name           = "shn",
    .long_name      = NULL_IF_CONFIG_SMALL("raw Shorten"),
    .read_header    = ff_raw_audio_read_header,
    .read_packet    = ff_raw_read_partial_packet,
    .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
    .extensions     = "shn",
    .raw_codec_id   = AV_CODEC_ID_SHORTEN,
};
#endif

#if CONFIG_VC1_DEMUXER
FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", AV_CODEC_ID_VC1)
#endif

---