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, swf->vframes_pos, SEEK_SET);
put_le16(pb, swf->video_frame_number);
url_fseek(pb, file_size, SEEK_SET);
}
return 0;
}
static int swf_write_trailer(AVFormatContext *s)
{
SWFContext *swf = s->priv_data;
AVIOContext *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 == AVMEDIA_TYPE_VIDEO)
video_enc = enc;
else
av_fifo_free(swf->audio_fifo);
}
put_swf_tag(s, TAG_END);
put_swf_end_tag(s);
avio_flush(s->pb);
/* patch file size and number of frames if not streamed */
if (s->pb->seekable && video_enc) {
file_size = avio_tell(pb);
avio_seek(pb, 4, SEEK_SET);
avio_wl32(pb, file_size);
avio_seek(pb, swf->duration_pos, SEEK_SET);
avio_wl16(pb, swf->video_frame_number);
avio_seek(pb, swf->vframes_pos, SEEK_SET);
avio_wl16(pb, swf->video_frame_number);
avio_seek(pb, file_size, SEEK_SET);
}
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);
swf->vframes_pos = url_ftell(pb);
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_header(AVFormatContext *s)
{
SWFContext *swf = s->priv_data;
ByteIOContext *pb = s->pb;
PutBitContext p;
uint8_t buf1[256];
int i, width, height, rate, rate_base;
int version;
swf->sound_samples = 0;
swf->swf_frame_number = 0;
swf->video_frame_number = 0;
for(i=0;i<s->nb_streams;i++) {
AVCodecContext *enc = s->streams[i]->codec;
if (enc->codec_type == CODEC_TYPE_AUDIO) {
if (enc->codec_id == CODEC_ID_MP3) {
if (!enc->frame_size) {
av_log(s, AV_LOG_ERROR, "audio frame size not set\n");
return -1;
}
swf->audio_enc = enc;
av_fifo_init(&swf->audio_fifo, AUDIO_FIFO_SIZE);
} else {
av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
return -1;
}
} else {
if (enc->codec_id == CODEC_ID_VP6F ||
enc->codec_id == CODEC_ID_FLV1 ||
enc->codec_id == CODEC_ID_MJPEG) {
swf->video_enc = enc;
} else {
av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n");
return -1;
}
}
}
if (!swf->video_enc) {
/* currently, cannot work correctly if audio only */
width = 320;
height = 200;
rate = 10;
rate_base= 1;
} else {
width = swf->video_enc->width;
height = swf->video_enc->height;
rate = swf->video_enc->time_base.den;
rate_base = swf->video_enc->time_base.num;
}
if (!swf->audio_enc)
swf->samples_per_frame = (44100. * rate_base) / rate;
else
swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
put_tag(pb, "FWS");
if (!strcmp("avm2", s->oformat->name))
version = 9;
else if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_VP6F)
version = 8; /* version 8 and above support VP6 codec */
else if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_FLV1)
version = 6; /* version 6 and above support FLV1 codec */
else
version = 4; /* version 4 for mpeg audio support */
put_byte(pb, version);
put_le32(pb, DUMMY_FILE_SIZE); /* dummy size
(will be patched if not streamed) */
put_swf_rect(pb, 0, width * 20, 0, height * 20);
put_le16(pb, (rate * 256) / rate_base); /* frame rate */
swf->duration_pos = url_ftell(pb);
put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
/* avm2/swf v9 (also v8?) files require a file attribute tag */
if (version == 9) {
put_swf_tag(s, TAG_FILEATTRIBUTES);
put_le32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
put_swf_end_tag(s);
}
/* define a shape with the jpeg inside */
if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_MJPEG) {
put_swf_tag(s, TAG_DEFINESHAPE);
put_le16(pb, SHAPE_ID); /* ID of shape */
/* bounding rectangle */
put_swf_rect(pb, 0, width, 0, height);
/* style info */
put_byte(pb, 1); /* one fill style */
put_byte(pb, 0x41); /* clipped bitmap fill */
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;
}
