yading@11: /*
yading@11:  * Flash Compatible Streaming Format muxer
yading@11:  * Copyright (c) 2000 Fabrice Bellard
yading@11:  * Copyright (c) 2003 Tinic Uro
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavcodec/put_bits.h"
yading@11: #include "libavutil/avassert.h"
yading@11: #include "avformat.h"
yading@11: #include "swf.h"
yading@11: 
yading@11: static void put_swf_tag(AVFormatContext *s, int tag)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11: 
yading@11:     swf->tag_pos = avio_tell(pb);
yading@11:     swf->tag = tag;
yading@11:     /* reserve some room for the tag */
yading@11:     if (tag & TAG_LONG) {
yading@11:         avio_wl16(pb, 0);
yading@11:         avio_wl32(pb, 0);
yading@11:     } else {
yading@11:         avio_wl16(pb, 0);
yading@11:     }
yading@11: }
yading@11: 
yading@11: static void put_swf_end_tag(AVFormatContext *s)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int64_t pos;
yading@11:     int tag_len, tag;
yading@11: 
yading@11:     pos = avio_tell(pb);
yading@11:     tag_len = pos - swf->tag_pos - 2;
yading@11:     tag = swf->tag;
yading@11:     avio_seek(pb, swf->tag_pos, SEEK_SET);
yading@11:     if (tag & TAG_LONG) {
yading@11:         tag &= ~TAG_LONG;
yading@11:         avio_wl16(pb, (tag << 6) | 0x3f);
yading@11:         avio_wl32(pb, tag_len - 4);
yading@11:     } else {
yading@11:         av_assert0(tag_len < 0x3f);
yading@11:         avio_wl16(pb, (tag << 6) | tag_len);
yading@11:     }
yading@11:     avio_seek(pb, pos, SEEK_SET);
yading@11: }
yading@11: 
yading@11: static inline void max_nbits(int *nbits_ptr, int val)
yading@11: {
yading@11:     int n;
yading@11: 
yading@11:     if (val == 0)
yading@11:         return;
yading@11:     val = abs(val);
yading@11:     n = 1;
yading@11:     while (val != 0) {
yading@11:         n++;
yading@11:         val >>= 1;
yading@11:     }
yading@11:     if (n > *nbits_ptr)
yading@11:         *nbits_ptr = n;
yading@11: }
yading@11: 
yading@11: static void put_swf_rect(AVIOContext *pb,
yading@11:                          int xmin, int xmax, int ymin, int ymax)
yading@11: {
yading@11:     PutBitContext p;
yading@11:     uint8_t buf[256];
yading@11:     int nbits, mask;
yading@11: 
yading@11:     init_put_bits(&p, buf, sizeof(buf));
yading@11: 
yading@11:     nbits = 0;
yading@11:     max_nbits(&nbits, xmin);
yading@11:     max_nbits(&nbits, xmax);
yading@11:     max_nbits(&nbits, ymin);
yading@11:     max_nbits(&nbits, ymax);
yading@11:     mask = (1 << nbits) - 1;
yading@11: 
yading@11:     /* rectangle info */
yading@11:     put_bits(&p, 5, nbits);
yading@11:     put_bits(&p, nbits, xmin & mask);
yading@11:     put_bits(&p, nbits, xmax & mask);
yading@11:     put_bits(&p, nbits, ymin & mask);
yading@11:     put_bits(&p, nbits, ymax & mask);
yading@11: 
yading@11:     flush_put_bits(&p);
yading@11:     avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
yading@11: }
yading@11: 
yading@11: static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
yading@11: {
yading@11:     int nbits, mask;
yading@11: 
yading@11:     put_bits(pb, 1, 1); /* edge */
yading@11:     put_bits(pb, 1, 1); /* line select */
yading@11:     nbits = 2;
yading@11:     max_nbits(&nbits, dx);
yading@11:     max_nbits(&nbits, dy);
yading@11: 
yading@11:     mask = (1 << nbits) - 1;
yading@11:     put_bits(pb, 4, nbits - 2); /* 16 bits precision */
yading@11:     if (dx == 0) {
yading@11:         put_bits(pb, 1, 0);
yading@11:         put_bits(pb, 1, 1);
yading@11:         put_bits(pb, nbits, dy & mask);
yading@11:     } else if (dy == 0) {
yading@11:         put_bits(pb, 1, 0);
yading@11:         put_bits(pb, 1, 0);
yading@11:         put_bits(pb, nbits, dx & mask);
yading@11:     } else {
yading@11:         put_bits(pb, 1, 1);
yading@11:         put_bits(pb, nbits, dx & mask);
yading@11:         put_bits(pb, nbits, dy & mask);
yading@11:     }
yading@11: }
yading@11: 
yading@11: #define FRAC_BITS 16
yading@11: 
yading@11: static void put_swf_matrix(AVIOContext *pb,
yading@11:                            int a, int b, int c, int d, int tx, int ty)
yading@11: {
yading@11:     PutBitContext p;
yading@11:     uint8_t buf[256];
yading@11:     int nbits;
yading@11: 
yading@11:     init_put_bits(&p, buf, sizeof(buf));
yading@11: 
yading@11:     put_bits(&p, 1, 1); /* a, d present */
yading@11:     nbits = 1;
yading@11:     max_nbits(&nbits, a);
yading@11:     max_nbits(&nbits, d);
yading@11:     put_bits(&p, 5, nbits); /* nb bits */
yading@11:     put_bits(&p, nbits, a);
yading@11:     put_bits(&p, nbits, d);
yading@11: 
yading@11:     put_bits(&p, 1, 1); /* b, c present */
yading@11:     nbits = 1;
yading@11:     max_nbits(&nbits, c);
yading@11:     max_nbits(&nbits, b);
yading@11:     put_bits(&p, 5, nbits); /* nb bits */
yading@11:     put_bits(&p, nbits, c);
yading@11:     put_bits(&p, nbits, b);
yading@11: 
yading@11:     nbits = 1;
yading@11:     max_nbits(&nbits, tx);
yading@11:     max_nbits(&nbits, ty);
yading@11:     put_bits(&p, 5, nbits); /* nb bits */
yading@11:     put_bits(&p, nbits, tx);
yading@11:     put_bits(&p, nbits, ty);
yading@11: 
yading@11:     flush_put_bits(&p);
yading@11:     avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
yading@11: }
yading@11: 
yading@11: static int swf_write_header(AVFormatContext *s)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     PutBitContext p;
yading@11:     uint8_t buf1[256];
yading@11:     int i, width, height, rate, rate_base;
yading@11:     int version;
yading@11: 
yading@11:     swf->sound_samples = 0;
yading@11:     swf->swf_frame_number = 0;
yading@11:     swf->video_frame_number = 0;
yading@11: 
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         AVCodecContext *enc = s->streams[i]->codec;
yading@11:         if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
yading@11:             if (swf->audio_enc) {
yading@11:                 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:             if (enc->codec_id == AV_CODEC_ID_MP3) {
yading@11:                 if (!enc->frame_size) {
yading@11:                     av_log(s, AV_LOG_ERROR, "audio frame size not set\n");
yading@11:                     return -1;
yading@11:                 }
yading@11:                 swf->audio_enc = enc;
yading@11:                 swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
yading@11:                 if (!swf->audio_fifo)
yading@11:                     return AVERROR(ENOMEM);
yading@11:             } else {
yading@11:                 av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
yading@11:                 return -1;
yading@11:             }
yading@11:         } else {
yading@11:             if (swf->video_enc) {
yading@11:                 av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:             if (enc->codec_id == AV_CODEC_ID_VP6F ||
yading@11:                 enc->codec_id == AV_CODEC_ID_FLV1 ||
yading@11:                 enc->codec_id == AV_CODEC_ID_MJPEG) {
yading@11:                 swf->video_enc = enc;
yading@11:             } else {
yading@11:                 av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
yading@11:                 return -1;
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (!swf->video_enc) {
yading@11:         /* currently, cannot work correctly if audio only */
yading@11:         width = 320;
yading@11:         height = 200;
yading@11:         rate = 10;
yading@11:         rate_base= 1;
yading@11:     } else {
yading@11:         width = swf->video_enc->width;
yading@11:         height = swf->video_enc->height;
yading@11:         rate = swf->video_enc->time_base.den;
yading@11:         rate_base = swf->video_enc->time_base.num;
yading@11:     }
yading@11: 
yading@11:     if (!swf->audio_enc)
yading@11:         swf->samples_per_frame = (44100. * rate_base) / rate;
yading@11:     else
yading@11:         swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
yading@11: 
yading@11:     avio_write(pb, "FWS", 3);
yading@11: 
yading@11:     if (!strcmp("avm2", s->oformat->name))
yading@11:         version = 9;
yading@11:     else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F)
yading@11:         version = 8; /* version 8 and above support VP6 codec */
yading@11:     else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1)
yading@11:         version = 6; /* version 6 and above support FLV1 codec */
yading@11:     else
yading@11:         version = 4; /* version 4 for mpeg audio support */
yading@11:     avio_w8(pb, version);
yading@11: 
yading@11:     avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
yading@11:                                       (will be patched if not streamed) */
yading@11: 
yading@11:     put_swf_rect(pb, 0, width * 20, 0, height * 20);
yading@11:     avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
yading@11:     swf->duration_pos = avio_tell(pb);
yading@11:     avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
yading@11: 
yading@11:     /* avm2/swf v9 (also v8?) files require a file attribute tag */
yading@11:     if (version == 9) {
yading@11:         put_swf_tag(s, TAG_FILEATTRIBUTES);
yading@11:         avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
yading@11:         put_swf_end_tag(s);
yading@11:     }
yading@11: 
yading@11:     /* define a shape with the jpeg inside */
yading@11:     if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) {
yading@11:         put_swf_tag(s, TAG_DEFINESHAPE);
yading@11: 
yading@11:         avio_wl16(pb, SHAPE_ID); /* ID of shape */
yading@11:         /* bounding rectangle */
yading@11:         put_swf_rect(pb, 0, width, 0, height);
yading@11:         /* style info */
yading@11:         avio_w8(pb, 1); /* one fill style */
yading@11:         avio_w8(pb, 0x41); /* clipped bitmap fill */
yading@11:         avio_wl16(pb, BITMAP_ID); /* bitmap ID */
yading@11:         /* position of the bitmap */
yading@11:         put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0,
yading@11:                        0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0);
yading@11:         avio_w8(pb, 0); /* no line style */
yading@11: 
yading@11:         /* shape drawing */
yading@11:         init_put_bits(&p, buf1, sizeof(buf1));
yading@11:         put_bits(&p, 4, 1); /* one fill bit */
yading@11:         put_bits(&p, 4, 0); /* zero line bit */
yading@11: 
yading@11:         put_bits(&p, 1, 0); /* not an edge */
yading@11:         put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
yading@11:         put_bits(&p, 5, 1); /* nbits */
yading@11:         put_bits(&p, 1, 0); /* X */
yading@11:         put_bits(&p, 1, 0); /* Y */
yading@11:         put_bits(&p, 1, 1); /* set fill style 1 */
yading@11: 
yading@11:         /* draw the rectangle ! */
yading@11:         put_swf_line_edge(&p, width, 0);
yading@11:         put_swf_line_edge(&p, 0, height);
yading@11:         put_swf_line_edge(&p, -width, 0);
yading@11:         put_swf_line_edge(&p, 0, -height);
yading@11: 
yading@11:         /* end of shape */
yading@11:         put_bits(&p, 1, 0); /* not an edge */
yading@11:         put_bits(&p, 5, 0);
yading@11: 
yading@11:         flush_put_bits(&p);
yading@11:         avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
yading@11: 
yading@11:         put_swf_end_tag(s);
yading@11:     }
yading@11: 
yading@11:     if (swf->audio_enc && swf->audio_enc->codec_id == AV_CODEC_ID_MP3) {
yading@11:         int v = 0;
yading@11: 
yading@11:         /* start sound */
yading@11:         put_swf_tag(s, TAG_STREAMHEAD2);
yading@11:         switch(swf->audio_enc->sample_rate) {
yading@11:         case 11025: v |= 1 << 2; break;
yading@11:         case 22050: v |= 2 << 2; break;
yading@11:         case 44100: v |= 3 << 2; break;
yading@11:         default:
yading@11:             /* not supported */
yading@11:             av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n");
yading@11:             return -1;
yading@11:         }
yading@11:         v |= 0x02; /* 16 bit playback */
yading@11:         if (swf->audio_enc->channels == 2)
yading@11:             v |= 0x01; /* stereo playback */
yading@11:         avio_w8(s->pb, v);
yading@11:         v |= 0x20; /* mp3 compressed */
yading@11:         avio_w8(s->pb, v);
yading@11:         avio_wl16(s->pb, swf->samples_per_frame);  /* avg samples per frame */
yading@11:         avio_wl16(s->pb, 0);
yading@11: 
yading@11:         put_swf_end_tag(s);
yading@11:     }
yading@11: 
yading@11:     avio_flush(s->pb);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int swf_write_video(AVFormatContext *s,
yading@11:                            AVCodecContext *enc, const uint8_t *buf, int size)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11: 
yading@11:     /* Flash Player limit */
yading@11:     if (swf->swf_frame_number == 16000)
yading@11:         av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
yading@11: 
yading@11:     if (enc->codec_id == AV_CODEC_ID_VP6F ||
yading@11:         enc->codec_id == AV_CODEC_ID_FLV1) {
yading@11:         if (swf->video_frame_number == 0) {
yading@11:             /* create a new video object */
yading@11:             put_swf_tag(s, TAG_VIDEOSTREAM);
yading@11:             avio_wl16(pb, VIDEO_ID);
yading@11:             swf->vframes_pos = avio_tell(pb);
yading@11:             avio_wl16(pb, 15000); /* hard flash player limit */
yading@11:             avio_wl16(pb, enc->width);
yading@11:             avio_wl16(pb, enc->height);
yading@11:             avio_w8(pb, 0);
yading@11:             avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id));
yading@11:             put_swf_end_tag(s);
yading@11: 
yading@11:             /* place the video object for the first time */
yading@11:             put_swf_tag(s, TAG_PLACEOBJECT2);
yading@11:             avio_w8(pb, 0x36);
yading@11:             avio_wl16(pb, 1);
yading@11:             avio_wl16(pb, VIDEO_ID);
yading@11:             put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
yading@11:             avio_wl16(pb, swf->video_frame_number);
yading@11:             avio_write(pb, "video", 5);
yading@11:             avio_w8(pb, 0x00);
yading@11:             put_swf_end_tag(s);
yading@11:         } else {
yading@11:             /* mark the character for update */
yading@11:             put_swf_tag(s, TAG_PLACEOBJECT2);
yading@11:             avio_w8(pb, 0x11);
yading@11:             avio_wl16(pb, 1);
yading@11:             avio_wl16(pb, swf->video_frame_number);
yading@11:             put_swf_end_tag(s);
yading@11:         }
yading@11: 
yading@11:         /* set video frame data */
yading@11:         put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
yading@11:         avio_wl16(pb, VIDEO_ID);
yading@11:         avio_wl16(pb, swf->video_frame_number++);
yading@11:         avio_write(pb, buf, size);
yading@11:         put_swf_end_tag(s);
yading@11:     } else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
yading@11:         if (swf->swf_frame_number > 0) {
yading@11:             /* remove the shape */
yading@11:             put_swf_tag(s, TAG_REMOVEOBJECT);
yading@11:             avio_wl16(pb, SHAPE_ID); /* shape ID */
yading@11:             avio_wl16(pb, 1); /* depth */
yading@11:             put_swf_end_tag(s);
yading@11: 
yading@11:             /* free the bitmap */
yading@11:             put_swf_tag(s, TAG_FREECHARACTER);
yading@11:             avio_wl16(pb, BITMAP_ID);
yading@11:             put_swf_end_tag(s);
yading@11:         }
yading@11: 
yading@11:         put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
yading@11: 
yading@11:         avio_wl16(pb, BITMAP_ID); /* ID of the image */
yading@11: 
yading@11:         /* a dummy jpeg header seems to be required */
yading@11:         avio_wb32(pb, 0xffd8ffd9);
yading@11:         /* write the jpeg image */
yading@11:         avio_write(pb, buf, size);
yading@11: 
yading@11:         put_swf_end_tag(s);
yading@11: 
yading@11:         /* draw the shape */
yading@11: 
yading@11:         put_swf_tag(s, TAG_PLACEOBJECT);
yading@11:         avio_wl16(pb, SHAPE_ID); /* shape ID */
yading@11:         avio_wl16(pb, 1); /* depth */
yading@11:         put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
yading@11:         put_swf_end_tag(s);
yading@11:     }
yading@11: 
yading@11:     swf->swf_frame_number++;
yading@11: 
yading@11:     /* streaming sound always should be placed just before showframe tags */
yading@11:     if (swf->audio_enc && av_fifo_size(swf->audio_fifo)) {
yading@11:         int frame_size = av_fifo_size(swf->audio_fifo);
yading@11:         put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
yading@11:         avio_wl16(pb, swf->sound_samples);
yading@11:         avio_wl16(pb, 0); // seek samples
yading@11:         av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
yading@11:         put_swf_end_tag(s);
yading@11: 
yading@11:         /* update FIFO */
yading@11:         swf->sound_samples = 0;
yading@11:     }
yading@11: 
yading@11:     /* output the frame */
yading@11:     put_swf_tag(s, TAG_SHOWFRAME);
yading@11:     put_swf_end_tag(s);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int swf_write_audio(AVFormatContext *s,
yading@11:                            AVCodecContext *enc, uint8_t *buf, int size)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11: 
yading@11:     /* Flash Player limit */
yading@11:     if (swf->swf_frame_number == 16000)
yading@11:         av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n");
yading@11: 
yading@11:     if (av_fifo_size(swf->audio_fifo) + size > AUDIO_FIFO_SIZE) {
yading@11:         av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
yading@11:         return -1;
yading@11:     }
yading@11: 
yading@11:     av_fifo_generic_write(swf->audio_fifo, buf, size, NULL);
yading@11:     swf->sound_samples += enc->frame_size;
yading@11: 
yading@11:     /* if audio only stream make sure we add swf frames */
yading@11:     if (!swf->video_enc)
yading@11:         swf_write_video(s, enc, 0, 0);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int swf_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
yading@11:     if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
yading@11:         return swf_write_audio(s, codec, pkt->data, pkt->size);
yading@11:     else
yading@11:         return swf_write_video(s, codec, pkt->data, pkt->size);
yading@11: }
yading@11: 
yading@11: static int swf_write_trailer(AVFormatContext *s)
yading@11: {
yading@11:     SWFContext *swf = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVCodecContext *enc, *video_enc;
yading@11:     int file_size, i;
yading@11: 
yading@11:     video_enc = NULL;
yading@11:     for(i=0;i<s->nb_streams;i++) {
yading@11:         enc = s->streams[i]->codec;
yading@11:         if (enc->codec_type == AVMEDIA_TYPE_VIDEO)
yading@11:             video_enc = enc;
yading@11:         else {
yading@11:             av_fifo_free(swf->audio_fifo);
yading@11:             swf->audio_fifo = NULL;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     put_swf_tag(s, TAG_END);
yading@11:     put_swf_end_tag(s);
yading@11: 
yading@11:     /* patch file size and number of frames if not streamed */
yading@11:     if (s->pb->seekable && video_enc) {
yading@11:         file_size = avio_tell(pb);
yading@11:         avio_seek(pb, 4, SEEK_SET);
yading@11:         avio_wl32(pb, file_size);
yading@11:         avio_seek(pb, swf->duration_pos, SEEK_SET);
yading@11:         avio_wl16(pb, swf->video_frame_number);
yading@11:         if (swf->vframes_pos) {
yading@11:         avio_seek(pb, swf->vframes_pos, SEEK_SET);
yading@11:         avio_wl16(pb, swf->video_frame_number);
yading@11:         }
yading@11:         avio_seek(pb, file_size, SEEK_SET);
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #if CONFIG_SWF_MUXER
yading@11: AVOutputFormat ff_swf_muxer = {
yading@11:     .name              = "swf",
yading@11:     .long_name         = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
yading@11:     .mime_type         = "application/x-shockwave-flash",
yading@11:     .extensions        = "swf",
yading@11:     .priv_data_size    = sizeof(SWFContext),
yading@11:     .audio_codec       = AV_CODEC_ID_MP3,
yading@11:     .video_codec       = AV_CODEC_ID_FLV1,
yading@11:     .write_header      = swf_write_header,
yading@11:     .write_packet      = swf_write_packet,
yading@11:     .write_trailer     = swf_write_trailer,
yading@11:     .flags             = AVFMT_TS_NONSTRICT,
yading@11: };
yading@11: #endif
yading@11: #if CONFIG_AVM2_MUXER
yading@11: AVOutputFormat ff_avm2_muxer = {
yading@11:     .name              = "avm2",
yading@11:     .long_name         = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
yading@11:     .mime_type         = "application/x-shockwave-flash",
yading@11:     .priv_data_size    = sizeof(SWFContext),
yading@11:     .audio_codec       = AV_CODEC_ID_MP3,
yading@11:     .video_codec       = AV_CODEC_ID_FLV1,
yading@11:     .write_header      = swf_write_header,
yading@11:     .write_packet      = swf_write_packet,
yading@11:     .write_trailer     = swf_write_trailer,
yading@11:     .flags             = AVFMT_TS_NONSTRICT,
yading@11: };
yading@11: #endif