forked from KolibriOS/kolibrios
546 lines
16 KiB
C
546 lines
16 KiB
C
/*
|
|
* Flash Compatible Streaming Format muxer
|
|
* Copyright (c) 2000 Fabrice Bellard
|
|
* Copyright (c) 2003 Tinic Uro
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavcodec/put_bits.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "avformat.h"
|
|
#include "swf.h"
|
|
|
|
static void put_swf_tag(AVFormatContext *s, int tag)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
|
|
swf->tag_pos = avio_tell(pb);
|
|
swf->tag = tag;
|
|
/* reserve some room for the tag */
|
|
if (tag & TAG_LONG) {
|
|
avio_wl16(pb, 0);
|
|
avio_wl32(pb, 0);
|
|
} else {
|
|
avio_wl16(pb, 0);
|
|
}
|
|
}
|
|
|
|
static void put_swf_end_tag(AVFormatContext *s)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int64_t pos;
|
|
int tag_len, tag;
|
|
|
|
pos = avio_tell(pb);
|
|
tag_len = pos - swf->tag_pos - 2;
|
|
tag = swf->tag;
|
|
avio_seek(pb, swf->tag_pos, SEEK_SET);
|
|
if (tag & TAG_LONG) {
|
|
tag &= ~TAG_LONG;
|
|
avio_wl16(pb, (tag << 6) | 0x3f);
|
|
avio_wl32(pb, tag_len - 4);
|
|
} else {
|
|
av_assert0(tag_len < 0x3f);
|
|
avio_wl16(pb, (tag << 6) | tag_len);
|
|
}
|
|
avio_seek(pb, pos, SEEK_SET);
|
|
}
|
|
|
|
static inline void max_nbits(int *nbits_ptr, int val)
|
|
{
|
|
int n;
|
|
|
|
if (val == 0)
|
|
return;
|
|
val = abs(val);
|
|
n = 1;
|
|
while (val != 0) {
|
|
n++;
|
|
val >>= 1;
|
|
}
|
|
if (n > *nbits_ptr)
|
|
*nbits_ptr = n;
|
|
}
|
|
|
|
static void put_swf_rect(AVIOContext *pb,
|
|
int xmin, int xmax, int ymin, int ymax)
|
|
{
|
|
PutBitContext p;
|
|
uint8_t buf[256];
|
|
int nbits, mask;
|
|
|
|
init_put_bits(&p, buf, sizeof(buf));
|
|
|
|
nbits = 0;
|
|
max_nbits(&nbits, xmin);
|
|
max_nbits(&nbits, xmax);
|
|
max_nbits(&nbits, ymin);
|
|
max_nbits(&nbits, ymax);
|
|
mask = (1 << nbits) - 1;
|
|
|
|
/* rectangle info */
|
|
put_bits(&p, 5, nbits);
|
|
put_bits(&p, nbits, xmin & mask);
|
|
put_bits(&p, nbits, xmax & mask);
|
|
put_bits(&p, nbits, ymin & mask);
|
|
put_bits(&p, nbits, ymax & mask);
|
|
|
|
flush_put_bits(&p);
|
|
avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
|
|
}
|
|
|
|
static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
|
|
{
|
|
int nbits, mask;
|
|
|
|
put_bits(pb, 1, 1); /* edge */
|
|
put_bits(pb, 1, 1); /* line select */
|
|
nbits = 2;
|
|
max_nbits(&nbits, dx);
|
|
max_nbits(&nbits, dy);
|
|
|
|
mask = (1 << nbits) - 1;
|
|
put_bits(pb, 4, nbits - 2); /* 16 bits precision */
|
|
if (dx == 0) {
|
|
put_bits(pb, 1, 0);
|
|
put_bits(pb, 1, 1);
|
|
put_bits(pb, nbits, dy & mask);
|
|
} else if (dy == 0) {
|
|
put_bits(pb, 1, 0);
|
|
put_bits(pb, 1, 0);
|
|
put_bits(pb, nbits, dx & mask);
|
|
} else {
|
|
put_bits(pb, 1, 1);
|
|
put_bits(pb, nbits, dx & mask);
|
|
put_bits(pb, nbits, dy & mask);
|
|
}
|
|
}
|
|
|
|
#define FRAC_BITS 16
|
|
|
|
static void put_swf_matrix(AVIOContext *pb,
|
|
int a, int b, int c, int d, int tx, int ty)
|
|
{
|
|
PutBitContext p;
|
|
uint8_t buf[256];
|
|
int nbits;
|
|
|
|
init_put_bits(&p, buf, sizeof(buf));
|
|
|
|
put_bits(&p, 1, 1); /* a, d present */
|
|
nbits = 1;
|
|
max_nbits(&nbits, a);
|
|
max_nbits(&nbits, d);
|
|
put_bits(&p, 5, nbits); /* nb bits */
|
|
put_bits(&p, nbits, a);
|
|
put_bits(&p, nbits, d);
|
|
|
|
put_bits(&p, 1, 1); /* b, c present */
|
|
nbits = 1;
|
|
max_nbits(&nbits, c);
|
|
max_nbits(&nbits, b);
|
|
put_bits(&p, 5, nbits); /* nb bits */
|
|
put_bits(&p, nbits, c);
|
|
put_bits(&p, nbits, b);
|
|
|
|
nbits = 1;
|
|
max_nbits(&nbits, tx);
|
|
max_nbits(&nbits, ty);
|
|
put_bits(&p, 5, nbits); /* nb bits */
|
|
put_bits(&p, nbits, tx);
|
|
put_bits(&p, nbits, ty);
|
|
|
|
flush_put_bits(&p);
|
|
avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
|
|
}
|
|
|
|
static int swf_write_header(AVFormatContext *s)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
AVIOContext *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 == AVMEDIA_TYPE_AUDIO) {
|
|
if (swf->audio_enc) {
|
|
av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (enc->codec_id == AV_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;
|
|
swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
|
|
if (!swf->audio_fifo)
|
|
return AVERROR(ENOMEM);
|
|
} else {
|
|
av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n");
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (swf->video_enc) {
|
|
av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (enc->codec_id == AV_CODEC_ID_VP6F ||
|
|
enc->codec_id == AV_CODEC_ID_FLV1 ||
|
|
enc->codec_id == AV_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 = (44100.0 * rate_base) / rate;
|
|
else
|
|
swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
|
|
|
|
avio_write(pb, "FWS", 3);
|
|
|
|
if (!strcmp("avm2", s->oformat->name))
|
|
version = 9;
|
|
else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_VP6F)
|
|
version = 8; /* version 8 and above support VP6 codec */
|
|
else if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_FLV1)
|
|
version = 6; /* version 6 and above support FLV1 codec */
|
|
else
|
|
version = 4; /* version 4 for mpeg audio support */
|
|
avio_w8(pb, version);
|
|
|
|
avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
|
|
(will be patched if not streamed) */
|
|
|
|
put_swf_rect(pb, 0, width * 20, 0, height * 20);
|
|
avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
|
|
swf->duration_pos = avio_tell(pb);
|
|
avio_wl16(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);
|
|
avio_wl32(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 == AV_CODEC_ID_MJPEG) {
|
|
put_swf_tag(s, TAG_DEFINESHAPE);
|
|
|
|
avio_wl16(pb, SHAPE_ID); /* ID of shape */
|
|
/* bounding rectangle */
|
|
put_swf_rect(pb, 0, width, 0, height);
|
|
/* style info */
|
|
avio_w8(pb, 1); /* one fill style */
|
|
avio_w8(pb, 0x41); /* clipped bitmap fill */
|
|
avio_wl16(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);
|
|
avio_w8(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);
|
|
avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
|
|
|
|
put_swf_end_tag(s);
|
|
}
|
|
|
|
if (swf->audio_enc && swf->audio_enc->codec_id == AV_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 */
|
|
avio_w8(s->pb, v);
|
|
v |= 0x20; /* mp3 compressed */
|
|
avio_w8(s->pb, v);
|
|
avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
|
|
avio_wl16(s->pb, 0);
|
|
|
|
put_swf_end_tag(s);
|
|
}
|
|
|
|
avio_flush(s->pb);
|
|
return 0;
|
|
}
|
|
|
|
static int swf_write_video(AVFormatContext *s,
|
|
AVCodecContext *enc, const uint8_t *buf, int size)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
AVIOContext *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 == AV_CODEC_ID_VP6F ||
|
|
enc->codec_id == AV_CODEC_ID_FLV1) {
|
|
if (swf->video_frame_number == 0) {
|
|
/* create a new video object */
|
|
put_swf_tag(s, TAG_VIDEOSTREAM);
|
|
avio_wl16(pb, VIDEO_ID);
|
|
swf->vframes_pos = avio_tell(pb);
|
|
avio_wl16(pb, 15000); /* hard flash player limit */
|
|
avio_wl16(pb, enc->width);
|
|
avio_wl16(pb, enc->height);
|
|
avio_w8(pb, 0);
|
|
avio_w8(pb,ff_codec_get_tag(ff_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);
|
|
avio_w8(pb, 0x36);
|
|
avio_wl16(pb, 1);
|
|
avio_wl16(pb, VIDEO_ID);
|
|
put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
|
|
avio_wl16(pb, swf->video_frame_number);
|
|
avio_write(pb, "video", 5);
|
|
avio_w8(pb, 0x00);
|
|
put_swf_end_tag(s);
|
|
} else {
|
|
/* mark the character for update */
|
|
put_swf_tag(s, TAG_PLACEOBJECT2);
|
|
avio_w8(pb, 0x11);
|
|
avio_wl16(pb, 1);
|
|
avio_wl16(pb, swf->video_frame_number);
|
|
put_swf_end_tag(s);
|
|
}
|
|
|
|
/* set video frame data */
|
|
put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
|
|
avio_wl16(pb, VIDEO_ID);
|
|
avio_wl16(pb, swf->video_frame_number++);
|
|
avio_write(pb, buf, size);
|
|
put_swf_end_tag(s);
|
|
} else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
|
|
if (swf->swf_frame_number > 0) {
|
|
/* remove the shape */
|
|
put_swf_tag(s, TAG_REMOVEOBJECT);
|
|
avio_wl16(pb, SHAPE_ID); /* shape ID */
|
|
avio_wl16(pb, 1); /* depth */
|
|
put_swf_end_tag(s);
|
|
|
|
/* free the bitmap */
|
|
put_swf_tag(s, TAG_FREECHARACTER);
|
|
avio_wl16(pb, BITMAP_ID);
|
|
put_swf_end_tag(s);
|
|
}
|
|
|
|
put_swf_tag(s, TAG_JPEG2 | TAG_LONG);
|
|
|
|
avio_wl16(pb, BITMAP_ID); /* ID of the image */
|
|
|
|
/* a dummy jpeg header seems to be required */
|
|
avio_wb32(pb, 0xffd8ffd9);
|
|
/* write the jpeg image */
|
|
avio_write(pb, buf, size);
|
|
|
|
put_swf_end_tag(s);
|
|
|
|
/* draw the shape */
|
|
|
|
put_swf_tag(s, TAG_PLACEOBJECT);
|
|
avio_wl16(pb, SHAPE_ID); /* shape ID */
|
|
avio_wl16(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);
|
|
avio_wl16(pb, swf->sound_samples);
|
|
avio_wl16(pb, 0); // seek samples
|
|
av_fifo_generic_read(swf->audio_fifo, pb, frame_size, (void*)avio_write);
|
|
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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int swf_write_audio(AVFormatContext *s,
|
|
AVCodecContext *enc, 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 == AVMEDIA_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;
|
|
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);
|
|
swf->audio_fifo = NULL;
|
|
}
|
|
}
|
|
|
|
put_swf_tag(s, TAG_END);
|
|
put_swf_end_tag(s);
|
|
|
|
/* 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);
|
|
if (swf->vframes_pos) {
|
|
avio_seek(pb, swf->vframes_pos, SEEK_SET);
|
|
avio_wl16(pb, swf->video_frame_number);
|
|
}
|
|
avio_seek(pb, file_size, SEEK_SET);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_SWF_MUXER
|
|
AVOutputFormat ff_swf_muxer = {
|
|
.name = "swf",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
|
|
.mime_type = "application/x-shockwave-flash",
|
|
.extensions = "swf",
|
|
.priv_data_size = sizeof(SWFContext),
|
|
.audio_codec = AV_CODEC_ID_MP3,
|
|
.video_codec = AV_CODEC_ID_FLV1,
|
|
.write_header = swf_write_header,
|
|
.write_packet = swf_write_packet,
|
|
.write_trailer = swf_write_trailer,
|
|
.flags = AVFMT_TS_NONSTRICT,
|
|
};
|
|
#endif
|
|
#if CONFIG_AVM2_MUXER
|
|
AVOutputFormat ff_avm2_muxer = {
|
|
.name = "avm2",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash) (AVM2)"),
|
|
.mime_type = "application/x-shockwave-flash",
|
|
.priv_data_size = sizeof(SWFContext),
|
|
.audio_codec = AV_CODEC_ID_MP3,
|
|
.video_codec = AV_CODEC_ID_FLV1,
|
|
.write_header = swf_write_header,
|
|
.write_packet = swf_write_packet,
|
|
.write_trailer = swf_write_trailer,
|
|
.flags = AVFMT_TS_NONSTRICT,
|
|
};
|
|
#endif
|