swfenc.c.svn-base

ffmpeg最新源码

        put_le16(pb, BITMAP_ID); /* bitmap ID */
        /* position of the bitmap */
        put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
                       0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
        put_byte(pb, 0); /* no line style */

        /* shape drawing */
        init_put_bits(&p, buf1, sizeof(buf1));
        put_bits(&p, 4, 1); /* one fill bit */
        put_bits(&p, 4, 0); /* zero line bit */

        put_bits(&p, 1, 0); /* not an edge */
        put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
        put_bits(&p, 5, 1); /* nbits */
        put_bits(&p, 1, 0); /* X */
        put_bits(&p, 1, 0); /* Y */
        put_bits(&p, 1, 1); /* set fill style 1 */

        /* draw the rectangle ! */
        put_swf_line_edge(&p, width, 0);
        put_swf_line_edge(&p, 0, height);
        put_swf_line_edge(&p, -width, 0);
        put_swf_line_edge(&p, 0, -height);

        /* end of shape */
        put_bits(&p, 1, 0); /* not an edge */
        put_bits(&p, 5, 0);

        flush_put_bits(&p);
        put_buffer(pb, buf1, pbBufPtr(&p) - p.buf);

        put_swf_end_tag(s);
    }

    if (swf->audio_enc && swf->audio_enc->codec_id == CODEC_ID_MP3) {
        int v = 0;

        /* start sound */
        put_swf_tag(s, TAG_STREAMHEAD2);
        switch(swf->audio_enc->sample_rate) {
        case 11025: v |= 1 << 2; break;
        case 22050: v |= 2 << 2; break;
        case 44100: v |= 3 << 2; break;
        default:
            /* not supported */
            av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
            return -1;
        }
        v |= 0x02; /* 16 bit playback */
        if (swf->audio_enc->channels == 2)
            v |= 0x01; /* stereo playback */
        put_byte(s->pb, v);
        v |= 0x20; /* mp3 compressed */
        put_byte(s->pb, v);
        put_le16(s->pb, swf->samples_per_frame);  /* avg samples per frame */
        put_le16(s->pb, 0);

        put_swf_end_tag(s);
    }

    put_flush_packet(s->pb);
    return 0;
}

static int swf_write_video(AVFormatContext *s,
                           AVCodecContext *enc, const uint8_t *buf, int size)
{
    SWFContext *swf = s->priv_data;
    ByteIOContext *pb = s->pb;

    /* Flash Player limit */
    if (swf->swf_frame_number == 16000)
        av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");

    if (enc->codec_id == CODEC_ID_VP6F ||
        enc->codec_id == CODEC_ID_FLV1) {
        if (swf->video_frame_number == 0) {
            /* create a new video object */
            put_swf_tag(s, TAG_VIDEOSTREAM);
            put_le16(pb, VIDEO_ID);
            put_le16(pb, 15000); /* hard flash player limit */
            put_le16(pb, enc->width);
            put_le16(pb, enc->height);
            put_byte(pb, 0);
            put_byte(pb,codec_get_tag(swf_codec_tags,enc->codec_id));
            put_swf_end_tag(s);

            /* place the video object for the first time */
            put_swf_tag(s, TAG_PLACEOBJECT2);
            put_byte(pb, 0x36);
            put_le16(pb, 1);
            put_le16(pb, VIDEO_ID);
            put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
            put_le16(pb, swf->video_frame_number);
            put_tag(pb, "video");
            put_byte(pb, 0x00);
            put_swf_end_tag(s);
        } else {
            /* mark the character for update */
            put_swf_tag(s, TAG_PLACEOBJECT2);
            put_byte(pb, 0x11);
            put_le16(pb, 1);
            put_le16(pb, swf->video_frame_number);
            put_swf_end_tag(s);
        }

        /* set video frame data */
        put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
        put_le16(pb, VIDEO_ID);
        put_le16(pb, swf->video_frame_number++);
        put_buffer(pb, buf, size);
        put_swf_end_tag(s);
    } else if (enc->codec_id == CODEC_ID_MJPEG) {
        if (swf->swf_frame_number > 0) {
            /* remove the shape */
            put_swf_tag(s, TAG_REMOVEOBJECT);
            put_le16(pb, SHAPE_ID); /* shape ID */
            put_le16(pb, 1); /* depth */
            put_swf_end_tag(s);

            /* free the bitmap */
            put_swf_tag(s, TAG_FREECHARACTER);
            put_le16(pb, BITMAP_ID);
            put_swf_end_tag(s);
        }

        put_swf_tag(s, TAG_JPEG2 | TAG_LONG);

        put_le16(pb, BITMAP_ID); /* ID of the image */

        /* a dummy jpeg header seems to be required */
        put_be32(pb, 0xffd8ffd9);
        /* write the jpeg image */
        put_buffer(pb, buf, size);

        put_swf_end_tag(s);

        /* draw the shape */

        put_swf_tag(s, TAG_PLACEOBJECT);
        put_le16(pb, SHAPE_ID); /* shape ID */
        put_le16(pb, 1); /* depth */
        put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
        put_swf_end_tag(s);
    }

    swf->swf_frame_number++;

    /* streaming sound always should be placed just before showframe tags */
    if (swf->audio_enc && av_fifo_size(&swf->audio_fifo)) {
        int frame_size = av_fifo_size(&swf->audio_fifo);
        put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
        put_le16(pb, swf->sound_samples);
        put_le16(pb, 0); // seek samples
        av_fifo_generic_read(&swf->audio_fifo, frame_size, &put_buffer, pb);
        put_swf_end_tag(s);

        /* update FIFO */
        swf->sound_samples = 0;
    }

    /* output the frame */
    put_swf_tag(s, TAG_SHOWFRAME);
    put_swf_end_tag(s);

    put_flush_packet(s->pb);

    return 0;
}

static int swf_write_audio(AVFormatContext *s,
                           AVCodecContext *enc, const uint8_t *buf, int size)
{
    SWFContext *swf = s->priv_data;

    /* Flash Player limit */
    if (swf->swf_frame_number == 16000)
        av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");

    if (av_fifo_size(&swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
        av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
        return -1;
    }

    av_fifo_generic_write(&swf->audio_fifo, buf, size, NULL);
    swf->sound_samples += enc->frame_size;

    /* if audio only stream make sure we add swf frames */
    if (!swf->video_enc)
        swf_write_video(s, enc, 0, 0);

    return 0;
}

static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
    if (codec->codec_type == CODEC_TYPE_AUDIO)
        return swf_write_audio(s, codec, pkt->data, pkt->size);
    else
        return swf_write_video(s, codec, pkt->data, pkt->size);
}

static int swf_write_trailer(AVFormatContext *s)
{
    SWFContext *swf = s->priv_data;
    ByteIOContext *pb = s->pb;
    AVCodecContext *enc, *video_enc;
    int file_size, i;

    video_enc = NULL;
    for(i=0;i<s->nb_streams;i++) {
        enc = s->streams[i]->codec;
        if (enc->codec_type == CODEC_TYPE_VIDEO)
            video_enc = enc;
        else
            av_fifo_free(&swf->audio_fifo);
    }

    put_swf_tag(s, TAG_END);
    put_swf_end_tag(s);

    put_flush_packet(s->pb);

    /* patch file size and number of frames if not streamed */
    if (!url_is_streamed(s->pb) && video_enc) {
        file_size = url_ftell(pb);
        url_fseek(pb, 4, SEEK_SET);
        put_le32(pb, file_size);
        url_fseek(pb, swf->duration_pos, SEEK_SET);
        put_le16(pb, swf->video_frame_number);
        url_fseek(pb, file_size, SEEK_SET);
    }
    return 0;
}

#ifdef CONFIG_SWF_MUXER
AVOutputFormat swf_muxer = {
    "swf",
    NULL_IF_CONFIG_SMALL("Flash format"),
    "application/x-shockwave-flash",
    "swf",
    sizeof(SWFContext),
    CODEC_ID_MP3,
    CODEC_ID_FLV1,
    swf_write_header,
    swf_write_packet,
    swf_write_trailer,
};
#endif
#ifdef CONFIG_AVM2_MUXER
AVOutputFormat avm2_muxer = {
    "avm2",
    NULL_IF_CONFIG_SMALL("Flash 9 (AVM2) format"),
    "application/x-shockwave-flash",
    NULL,
    sizeof(SWFContext),
    CODEC_ID_MP3,
    CODEC_ID_FLV1,
    swf_write_header,
    swf_write_packet,
    swf_write_trailer,
};
#endif