avienc.c

ffmpeg源码分析

/*
 * AVI encoder.
 * Copyright (c) 2000 Fabrice Bellard.
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include "avformat.h"
#include "avi.h"

/*
 * TODO:
 *  - fill all fields if non streamed (nb_frames for example)
 */

#ifdef CONFIG_MUXERS
typedef struct AVIIentry {
    unsigned int flags, pos, len;
} AVIIentry;

#define AVI_INDEX_CLUSTER_SIZE 16384

typedef struct AVIIndex {
    offset_t    indx_start;
    int         entry;
    int         ents_allocated;
    AVIIentry** cluster;
} AVIIndex;

typedef struct {
    offset_t riff_start, movi_list, odml_list;
    offset_t frames_hdr_all, frames_hdr_strm[MAX_STREAMS];
    int audio_strm_length[MAX_STREAMS];
    int riff_id;
    int packet_count[MAX_STREAMS];

    AVIIndex indexes[MAX_STREAMS];
} AVIContext;

static inline AVIIentry* avi_get_ientry(AVIIndex* idx, int ent_id)
{
    int cl = ent_id / AVI_INDEX_CLUSTER_SIZE;
    int id = ent_id % AVI_INDEX_CLUSTER_SIZE;
    return &idx->cluster[cl][id];
}

offset_t start_tag(ByteIOContext *pb, const char *tag)
{
    put_tag(pb, tag);
    put_le32(pb, 0);
    return url_ftell(pb);
}

void end_tag(ByteIOContext *pb, offset_t start)
{
    offset_t pos;

    pos = url_ftell(pb);
    url_fseek(pb, start - 4, SEEK_SET);
    put_le32(pb, (uint32_t)(pos - start));
    url_fseek(pb, pos, SEEK_SET);
}
#endif //CONFIG_MUXERS

/* Note: when encoding, the first matching tag is used, so order is
   important if multiple tags possible for a given codec. */
const CodecTag codec_bmp_tags[] = {
    { CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
    { CODEC_ID_H264, MKTAG('h', '2', '6', '4') },
    { CODEC_ID_H264, MKTAG('X', '2', '6', '4') },
    { CODEC_ID_H264, MKTAG('x', '2', '6', '4') },
    { CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') },
    { CODEC_ID_H264, MKTAG('V', 'S', 'S', 'H') },

    { CODEC_ID_H263, MKTAG('H', '2', '6', '3') },
    { CODEC_ID_H263P, MKTAG('H', '2', '6', '3') },
    { CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
    { CODEC_ID_H261, MKTAG('H', '2', '6', '1') },

    /* added based on MPlayer */
    { CODEC_ID_H263P, MKTAG('U', '2', '6', '3') },
    { CODEC_ID_H263P, MKTAG('v', 'i', 'v', '1') },

    { CODEC_ID_MPEG4, MKTAG('F', 'M', 'P', '4')},
    { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X'), .invalid_asf = 1 },
    { CODEC_ID_MPEG4, MKTAG('D', 'X', '5', '0'), .invalid_asf = 1 },
    { CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D'), .invalid_asf = 1 },
    { CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
    { CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
    { CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */

    /* added based on MPlayer */
    { CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', '1') },
    { CODEC_ID_MPEG4, MKTAG('B', 'L', 'Z', '0') },
    { CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
    { CODEC_ID_MPEG4, MKTAG('U', 'M', 'P', '4') },
    { CODEC_ID_MPEG4, MKTAG('W', 'V', '1', 'F') },
    { CODEC_ID_MPEG4, MKTAG('S', 'E', 'D', 'G') },

    { CODEC_ID_MPEG4, MKTAG('R', 'M', 'P', '4') },

    { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3'), .invalid_asf = 1 }, /* default signature when using MSMPEG4 */
    { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },

    /* added based on MPlayer */
    { CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', 'G', '3') },
    { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '5') },
    { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '6') },
    { CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '4') },
    { CODEC_ID_MSMPEG4V3, MKTAG('A', 'P', '4', '1') },
    { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '1') },
    { CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '0') },

    { CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },

    /* added based on MPlayer */
    { CODEC_ID_MSMPEG4V2, MKTAG('D', 'I', 'V', '2') },

    { CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', 'G', '4') },

    { CODEC_ID_WMV1, MKTAG('W', 'M', 'V', '1') },

    /* added based on MPlayer */
    { CODEC_ID_WMV2, MKTAG('W', 'M', 'V', '2') },
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'd') },
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'd') },
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'l') },
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', '2', '5') },
    { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
    { CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
    { CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
    { CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
    { CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
    { CODEC_ID_MPEG1VIDEO, 0x10000001 },
    { CODEC_ID_MPEG2VIDEO, 0x10000002 },
    { CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
    { CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
    { CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
    { CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
    { CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
    { CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
    { CODEC_ID_JPEGLS, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
    { CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
    { CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
    { CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
    { CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
    { CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
    { CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
    { CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
    { CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
    { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
    { CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
    { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
    { CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
    { CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
    { CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
    { CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
    { CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
    { CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
    { CODEC_ID_MSRLE, MKTAG(0x1, 0x0, 0x0, 0x0) },
    { CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
    { CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
    { CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
    { CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
    { CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
    { CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
    { CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
    { CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
    { CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
    { CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
    { CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
    { CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
    { CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
    { CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
    { CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
    { CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
    { CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
    { CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
    { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
    { CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
    { CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
    { CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
    { CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
    { CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
    { CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
    { CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
    { CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
    { CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
    { CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
    { CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
    { CODEC_ID_RAWVIDEO, 0 },
    { CODEC_ID_NONE, 0 },
};

unsigned int codec_get_tag(const CodecTag *tags, int id)
{
    while (tags->id != CODEC_ID_NONE) {
        if (tags->id == id)
            return tags->tag;
        tags++;
    }
    return 0;
}

static unsigned int codec_get_asf_tag(const CodecTag *tags, unsigned int id)
{
    while (tags->id != CODEC_ID_NONE) {
        if (!tags->invalid_asf && tags->id == id)
            return tags->tag;
        tags++;
    }
    return 0;
}

enum CodecID codec_get_id(const CodecTag *tags, unsigned int tag)
{
    while (tags->id != CODEC_ID_NONE) {
        if(   toupper((tag >> 0)&0xFF) == toupper((tags->tag >> 0)&0xFF)
           && toupper((tag >> 8)&0xFF) == toupper((tags->tag >> 8)&0xFF)
           && toupper((tag >>16)&0xFF) == toupper((tags->tag >>16)&0xFF)
           && toupper((tag >>24)&0xFF) == toupper((tags->tag >>24)&0xFF))
            return tags->id;
        tags++;
    }
    return CODEC_ID_NONE;
}

unsigned int codec_get_bmp_tag(int id)
{
    return codec_get_tag(codec_bmp_tags, id);
}

unsigned int codec_get_wav_tag(int id)
{
    return codec_get_tag(codec_wav_tags, id);
}

enum CodecID codec_get_bmp_id(unsigned int tag)
{
    return codec_get_id(codec_bmp_tags, tag);
}

enum CodecID codec_get_wav_id(unsigned int tag)
{
    return codec_get_id(codec_wav_tags, tag);
}

#ifdef CONFIG_MUXERS
/* BITMAPINFOHEADER header */
void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, const CodecTag *tags, int for_asf)
{
    put_le32(pb, 40 + enc->extradata_size); /* size */
    put_le32(pb, enc->width);
    put_le32(pb, enc->height);
    put_le16(pb, 1); /* planes */

    put_le16(pb, enc->bits_per_sample ? enc->bits_per_sample : 24); /* depth */
    /* compression type */
    put_le32(pb, for_asf ? (enc->codec_tag ? enc->codec_tag : codec_get_asf_tag(tags, enc->codec_id)) : enc->codec_tag); //
    put_le32(pb, enc->width * enc->height * 3);
    put_le32(pb, 0);
    put_le32(pb, 0);
    put_le32(pb, 0);
    put_le32(pb, 0);

    put_buffer(pb, enc->extradata, enc->extradata_size);

    if (enc->extradata_size & 1)
        put_byte(pb, 0);
}

void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
{
    int gcd;

    *au_ssize= stream->block_align;
    if(stream->frame_size && stream->sample_rate){
        *au_scale=stream->frame_size;
        *au_rate= stream->sample_rate;
    }else if(stream->codec_type == CODEC_TYPE_VIDEO){
        *au_scale= stream->time_base.num;
        *au_rate = stream->time_base.den;
    }else{
        *au_scale= stream->block_align ? stream->block_align*8 : 8;
        *au_rate = stream->bit_rate;
    }
    gcd= ff_gcd(*au_scale, *au_rate);
    *au_scale /= gcd;
    *au_rate /= gcd;
}

static offset_t avi_start_new_riff(AVIContext *avi, ByteIOContext *pb,
                                   const char* riff_tag, const char* list_tag)
{
    offset_t loff;
    int i;

    avi->riff_id++;
    for (i=0; i<MAX_STREAMS; i++)
         avi->indexes[i].entry = 0;

    avi->riff_start = start_tag(pb, "RIFF");
    put_tag(pb, riff_tag);
    loff = start_tag(pb, "LIST");
    put_tag(pb, list_tag);
    return loff;
}

static unsigned char* avi_stream2fourcc(unsigned char* tag, int index,
                                        enum CodecType type)
{
    tag[0] = '0';
    tag[1] = '0' + index;
    if (type == CODEC_TYPE_VIDEO) {
        tag[2] = 'd';
        tag[3] = 'c';
    } else {
        tag[2] = 'w';
        tag[3] = 'b';
    }
    tag[4] = '\0';
    return tag;
}

static int avi_write_header(AVFormatContext *s)
{
    AVIContext *avi = s->priv_data;
    ByteIOContext *pb = &s->pb;
    int bitrate, n, i, nb_frames, au_byterate, au_ssize, au_scale;
    AVCodecContext *stream, *video_enc;
    offset_t list1, list2, strh, strf;

    /* header list */
    avi->riff_id = 0;
    list1 = avi_start_new_riff(avi, pb, "AVI ", "hdrl");

    /* avi header */
    put_tag(pb, "avih");
    put_le32(pb, 14 * 4);
    bitrate = 0;

    video_enc = NULL;
    for(n=0;n<s->nb_streams;n++) {
        stream = s->streams[n]->codec;
        bitrate += stream->bit_rate;
        if (stream->codec_type == CODEC_TYPE_VIDEO)
            video_enc = stream;
    }

    nb_frames = 0;

    if(video_enc){
        put_le32(pb, (uint32_t)(int64_t_C(1000000) * video_enc->time_base.num / video_enc->time_base.den));
    } else {
        put_le32(pb, 0);
    }
    put_le32(pb, bitrate / 8); /* XXX: not quite exact */
    put_le32(pb, 0); /* padding */
    if (url_is_streamed(pb))
        put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
    else
        put_le32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
    avi->frames_hdr_all = url_ftell(pb); /* remember this offset to fill later */
    put_le32(pb, nb_frames); /* nb frames, filled later */
    put_le32(pb, 0); /* initial frame */
    put_le32(pb, s->nb_streams); /* nb streams */
    put_le32(pb, 1024 * 1024); /* suggested buffer size */
    if(video_enc){
        put_le32(pb, video_enc->width);
        put_le32(pb, video_enc->height);
    } else {
        put_le32(pb, 0);
        put_le32(pb, 0);
    }
    put_le32(pb, 0); /* reserved */
    put_le32(pb, 0); /* reserved */
    put_le32(pb, 0); /* reserved */
    put_le32(pb, 0); /* reserved */