raw.c

ffmpeg源码分析

    "aac",
    "ADTS AAC",
    0,
    NULL,
    aac_read_header,
    raw_read_partial_packet,
    raw_read_close,
    .extensions = "aac",
};

AVInputFormat h261_iformat = {
    "h261",
    "raw h261",
    0,
    h261_probe,
    video_read_header,
    raw_read_partial_packet,
    raw_read_close,
    .extensions = "h261",
    .value = CODEC_ID_H261,
};

#ifdef CONFIG_MUXERS
AVOutputFormat h261_oformat = {
    "h261",
    "raw h261",
    "video/x-h261",
    "h261",
    0,
    0,
    CODEC_ID_H261,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

AVInputFormat h263_iformat = {
    "h263",
    "raw h263",
    0,
    h263_probe,
    video_read_header,
    raw_read_partial_packet,
    raw_read_close,
//    .extensions = "h263", //FIXME remove after writing mpeg4_probe
    .value = CODEC_ID_H263,
};

#ifdef CONFIG_MUXERS
AVOutputFormat h263_oformat = {
    "h263",
    "raw h263",
    "video/x-h263",
    "h263",
    0,
    0,
    CODEC_ID_H263,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

AVInputFormat m4v_iformat = {
    "m4v",
    "raw MPEG4 video format",
    0,
    NULL /*mpegvideo_probe*/,
    video_read_header,
    raw_read_partial_packet,
    raw_read_close,
    .extensions = "m4v", //FIXME remove after writing mpeg4_probe
    .value = CODEC_ID_MPEG4,
};

#ifdef CONFIG_MUXERS
AVOutputFormat m4v_oformat = {
    "m4v",
    "raw MPEG4 video format",
    NULL,
    "m4v",
    0,
    CODEC_ID_NONE,
    CODEC_ID_MPEG4,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

AVInputFormat h264_iformat = {
    "h264",
    "raw H264 video format",
    0,
    NULL /*mpegvideo_probe*/,
    video_read_header,
    raw_read_partial_packet,
    raw_read_close,
    .extensions = "h26l,h264,264", //FIXME remove after writing mpeg4_probe
    .value = CODEC_ID_H264,
};

#ifdef CONFIG_MUXERS
AVOutputFormat h264_oformat = {
    "h264",
    "raw H264 video format",
    NULL,
    "h264",
    0,
    CODEC_ID_NONE,
    CODEC_ID_H264,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

AVInputFormat mpegvideo_iformat = {
    "mpegvideo",
    "MPEG video",
    0,
    mpegvideo_probe,
    video_read_header,
    raw_read_partial_packet,
    raw_read_close,
    .value = CODEC_ID_MPEG1VIDEO,
};

#ifdef CONFIG_MUXERS
AVOutputFormat mpeg1video_oformat = {
    "mpeg1video",
    "MPEG video",
    "video/x-mpeg",
    "mpg,mpeg,m1v",
    0,
    0,
    CODEC_ID_MPEG1VIDEO,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

#ifdef CONFIG_MUXERS
AVOutputFormat mpeg2video_oformat = {
    "mpeg2video",
    "MPEG2 video",
    NULL,
    "m2v",
    0,
    0,
    CODEC_ID_MPEG2VIDEO,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

AVInputFormat mjpeg_iformat = {
    "mjpeg",
    "MJPEG video",
    0,
    NULL,
    video_read_header,
    raw_read_partial_packet,
    raw_read_close,
    .extensions = "mjpg,mjpeg",
    .value = CODEC_ID_MJPEG,
};

AVInputFormat ingenient_iformat = {
    "ingenient",
    "Ingenient MJPEG",
    0,
    NULL,
    video_read_header,
    ingenient_read_packet,
    raw_read_close,
    .extensions = "cgi", // FIXME
    .value = CODEC_ID_MJPEG,
};

#ifdef CONFIG_MUXERS
AVOutputFormat mjpeg_oformat = {
    "mjpeg",
    "MJPEG video",
    "video/x-mjpeg",
    "mjpg,mjpeg",
    0,
    0,
    CODEC_ID_MJPEG,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

/* pcm formats */

#define PCMINPUTDEF(name, long_name, ext, codec) \
AVInputFormat pcm_ ## name ## _iformat = {\
    #name,\
    long_name,\
    0,\
    NULL,\
    raw_read_header,\
    raw_read_packet,\
    raw_read_close,\
    pcm_read_seek,\
    .extensions = ext,\
    .value = codec,\
};

#if !defined(CONFIG_MUXERS) && defined(CONFIG_DEMUXERS)

#define PCMDEF(name, long_name, ext, codec) \
    PCMINPUTDEF(name, long_name, ext, codec)

#else

#define PCMDEF(name, long_name, ext, codec) \
    PCMINPUTDEF(name, long_name, ext, codec)\
\
AVOutputFormat pcm_ ## name ## _oformat = {\
    #name,\
    long_name,\
    NULL,\
    ext,\
    0,\
    codec,\
    0,\
    raw_write_header,\
    raw_write_packet,\
    raw_write_trailer,\
};
#endif //CONFIG_MUXERS

#ifdef WORDS_BIGENDIAN
#define BE_DEF(s) s
#define LE_DEF(s) NULL
#else
#define BE_DEF(s) NULL
#define LE_DEF(s) s
#endif


PCMDEF(s16le, "pcm signed 16 bit little endian format",
       LE_DEF("sw"), CODEC_ID_PCM_S16LE)

PCMDEF(s16be, "pcm signed 16 bit big endian format",
       BE_DEF("sw"), CODEC_ID_PCM_S16BE)

PCMDEF(u16le, "pcm unsigned 16 bit little endian format",
       LE_DEF("uw"), CODEC_ID_PCM_U16LE)

PCMDEF(u16be, "pcm unsigned 16 bit big endian format",
       BE_DEF("uw"), CODEC_ID_PCM_U16BE)

PCMDEF(s8, "pcm signed 8 bit format",
       "sb", CODEC_ID_PCM_S8)

PCMDEF(u8, "pcm unsigned 8 bit format",
       "ub", CODEC_ID_PCM_U8)

PCMDEF(mulaw, "pcm mu law format",
       "ul", CODEC_ID_PCM_MULAW)

PCMDEF(alaw, "pcm A law format",
       "al", CODEC_ID_PCM_ALAW)

static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int packet_size, ret, width, height;
    AVStream *st = s->streams[0];

    width = st->codec->width;
    height = st->codec->height;

    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
    if (packet_size < 0)
        return -1;

    ret= av_get_packet(&s->pb, pkt, packet_size);

    pkt->stream_index = 0;
    if (ret != packet_size) {
        return AVERROR_IO;
    } else {
        return 0;
    }
}

AVInputFormat rawvideo_iformat = {
    "rawvideo",
    "raw video format",
    0,
    NULL,
    raw_read_header,
    rawvideo_read_packet,
    raw_read_close,
    .extensions = "yuv,cif,qcif",
    .value = CODEC_ID_RAWVIDEO,
};

#ifdef CONFIG_MUXERS
AVOutputFormat rawvideo_oformat = {
    "rawvideo",
    "raw video format",
    NULL,
    "yuv",
    0,
    CODEC_ID_NONE,
    CODEC_ID_RAWVIDEO,
    raw_write_header,
    raw_write_packet,
    raw_write_trailer,
};
#endif //CONFIG_MUXERS

#ifdef CONFIG_MUXERS
static int null_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
    return 0;
}

AVOutputFormat null_oformat = {
    "null",
    "null video format",
    NULL,
    NULL,
    0,
#ifdef WORDS_BIGENDIAN
    CODEC_ID_PCM_S16BE,
#else
    CODEC_ID_PCM_S16LE,
#endif
    CODEC_ID_RAWVIDEO,
    raw_write_header,
    null_write_packet,
    raw_write_trailer,
    .flags = AVFMT_NOFILE | AVFMT_RAWPICTURE,
};
#endif //CONFIG_MUXERS

#ifndef CONFIG_MUXERS
#define av_register_output_format(format)
#endif
#ifndef CONFIG_DEMUXERS
#define av_register_input_format(format)
#endif

int raw_init(void)
{

    av_register_input_format(&shorten_iformat);

    av_register_input_format(&ac3_iformat);
    av_register_output_format(&ac3_oformat);

    av_register_input_format(&aac_iformat);

    av_register_input_format(&dts_iformat);

    av_register_input_format(&h261_iformat);
    av_register_output_format(&h261_oformat);

    av_register_input_format(&h263_iformat);
    av_register_output_format(&h263_oformat);

    av_register_input_format(&m4v_iformat);
    av_register_output_format(&m4v_oformat);

    av_register_input_format(&h264_iformat);
    av_register_output_format(&h264_oformat);

    av_register_input_format(&mpegvideo_iformat);
    av_register_output_format(&mpeg1video_oformat);

    av_register_output_format(&mpeg2video_oformat);

    av_register_input_format(&mjpeg_iformat);
    av_register_output_format(&mjpeg_oformat);

    av_register_input_format(&ingenient_iformat);

    av_register_input_format(&pcm_s16le_iformat);
    av_register_output_format(&pcm_s16le_oformat);
    av_register_input_format(&pcm_s16be_iformat);
    av_register_output_format(&pcm_s16be_oformat);
    av_register_input_format(&pcm_u16le_iformat);
    av_register_output_format(&pcm_u16le_oformat);
    av_register_input_format(&pcm_u16be_iformat);
    av_register_output_format(&pcm_u16be_oformat);
    av_register_input_format(&pcm_s8_iformat);
    av_register_output_format(&pcm_s8_oformat);
    av_register_input_format(&pcm_u8_iformat);
    av_register_output_format(&pcm_u8_oformat);
    av_register_input_format(&pcm_mulaw_iformat);
    av_register_output_format(&pcm_mulaw_oformat);
    av_register_input_format(&pcm_alaw_iformat);
    av_register_output_format(&pcm_alaw_oformat);

    av_register_input_format(&rawvideo_iformat);
    av_register_output_format(&rawvideo_oformat);

    av_register_output_format(&null_oformat);
    return 0;
}