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/* |
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* Flash Compatible Streaming Format muxer |
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* Copyright (c) 2000 Fabrice Bellard
* Copyright (c) 2003 Tinic Uro |
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* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavcodec/bitstream.h" |
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#include "avformat.h" |
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#include "swf.h" |
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|
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static void put_swf_tag(AVFormatContext *s, int tag)
{
SWFContext *swf = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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swf->tag_pos = url_ftell(pb);
swf->tag = tag;
/* reserve some room for the tag */
if (tag & TAG_LONG) {
put_le16(pb, 0);
put_le32(pb, 0);
} else {
put_le16(pb, 0);
}
}
static void put_swf_end_tag(AVFormatContext *s)
{
SWFContext *swf = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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int64_t pos; |
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int tag_len, tag;
pos = url_ftell(pb);
tag_len = pos - swf->tag_pos - 2;
tag = swf->tag;
url_fseek(pb, swf->tag_pos, SEEK_SET);
if (tag & TAG_LONG) {
tag &= ~TAG_LONG;
put_le16(pb, (tag << 6) | 0x3f);
put_le32(pb, tag_len - 4);
} else {
assert(tag_len < 0x3f);
put_le16(pb, (tag << 6) | tag_len);
}
url_fseek(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;
}
|
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static void put_swf_rect(ByteIOContext *pb, |
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int xmin, int xmax, int ymin, int ymax)
{
PutBitContext p; |
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uint8_t buf[256]; |
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int nbits, mask;
|
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init_put_bits(&p, buf, sizeof(buf)); |
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|
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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); |
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|
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flush_put_bits(&p); |
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put_buffer(pb, buf, pbBufPtr(&p) - p.buf); |
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}
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) { |
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put_bits(pb, 1, 0);
put_bits(pb, 1, 1);
put_bits(pb, nbits, dy & mask); |
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} else if (dy == 0) { |
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put_bits(pb, 1, 0);
put_bits(pb, 1, 0);
put_bits(pb, nbits, dx & mask); |
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} else { |
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put_bits(pb, 1, 1);
put_bits(pb, nbits, dx & mask);
put_bits(pb, nbits, dy & mask); |
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}
}
#define FRAC_BITS 16
static void put_swf_matrix(ByteIOContext *pb,
int a, int b, int c, int d, int tx, int ty)
{
PutBitContext p; |
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uint8_t buf[256]; |
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int nbits; |
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|
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init_put_bits(&p, buf, sizeof(buf)); |
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|
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put_bits(&p, 1, 1); /* a, d present */ |
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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); |
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|
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put_bits(&p, 1, 1); /* b, c present */ |
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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); |
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flush_put_bits(&p); |
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put_buffer(pb, buf, pbBufPtr(&p) - p.buf); |
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}
static int swf_write_header(AVFormatContext *s)
{ |
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SWFContext *swf = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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PutBitContext p; |
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uint8_t buf1[256]; |
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int i, width, height, rate, rate_base; |
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int version; |
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|
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swf->sound_samples = 0;
swf->swf_frame_number = 0;
swf->video_frame_number = 0;
|
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for(i=0;i<s->nb_streams;i++) { |
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AVCodecContext *enc = s->streams[i]->codec; |
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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;
} |
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swf->audio_enc = enc; |
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av_fifo_init(&swf->audio_fifo, AUDIO_FIFO_SIZE); |
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} else { |
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av_log(s, AV_LOG_ERROR, "SWF muxer only supports MP3\n"); |
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return -1;
}
} else { |
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if (enc->codec_id == CODEC_ID_VP6F ||
enc->codec_id == CODEC_ID_FLV1 ||
enc->codec_id == CODEC_ID_MJPEG) { |
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swf->video_enc = enc; |
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} else { |
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av_log(s, AV_LOG_ERROR, "SWF muxer only supports VP6, FLV1 and MJPEG\n"); |
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return -1;
}
} |
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}
|
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if (!swf->video_enc) { |
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/* currently, cannot work correctly if audio only */ |
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width = 320;
height = 200; |
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rate = 10;
rate_base= 1; |
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} else { |
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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; |
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}
|
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if (!swf->audio_enc) |
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swf->samples_per_frame = (44100. * rate_base) / rate; |
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else
swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate; |
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|
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put_tag(pb, "FWS"); |
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if (!strcmp("avm2", s->oformat->name))
version = 9; |
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else if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_VP6F) |
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version = 8; /* version 8 and above support VP6 codec */ |
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else if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_FLV1) |
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version = 6; /* version 6 and above support FLV1 codec */ |
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else |
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version = 4; /* version 4 for mpeg audio support */
put_byte(pb, version);
|
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put_le32(pb, DUMMY_FILE_SIZE); /* dummy size
(will be patched if not streamed) */ |
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|
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put_swf_rect(pb, 0, width * 20, 0, height * 20); |
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put_le16(pb, (rate * 256) / rate_base); /* frame rate */ |
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swf->duration_pos = url_ftell(pb); |
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put_le16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */ |
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|
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/* avm2/swf v9 (also v8?) files require a file attribute tag */ |
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if (version == 9) { |
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put_swf_tag(s, TAG_FILEATTRIBUTES);
put_le32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
put_swf_end_tag(s);
}
|
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/* define a shape with the jpeg inside */ |
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if (swf->video_enc && swf->video_enc->codec_id == CODEC_ID_MJPEG) { |
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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 */ |
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put_swf_matrix(pb, (int)(1.0 * (1 << FRAC_BITS)), 0, |
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0, (int)(1.0 * (1 << FRAC_BITS)), 0, 0); |
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put_byte(pb, 0); /* no line style */ |
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|
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/* 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 */ |
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|
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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 */ |
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|
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/* 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); |
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|
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/* end of shape */
put_bits(&p, 1, 0); /* not an edge */
put_bits(&p, 5, 0); |
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|
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flush_put_bits(&p);
put_buffer(pb, buf1, pbBufPtr(&p) - p.buf); |
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|
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put_swf_end_tag(s);
} |
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|
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if (swf->audio_enc && swf->audio_enc->codec_id == CODEC_ID_MP3) { |
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int v = 0; |
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/* start sound */ |
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put_swf_tag(s, TAG_STREAMHEAD2); |
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switch(swf->audio_enc->sample_rate) { |
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case 11025: v |= 1 << 2; break;
case 22050: v |= 2 << 2; break;
case 44100: v |= 3 << 2; break; |
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default:
/* not supported */ |
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av_log(s, AV_LOG_ERROR, "swf does not support that sample rate, choose from (44100, 22050, 11025).\n"); |
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return -1;
} |
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v |= 0x02; /* 16 bit playback */ |
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if (swf->audio_enc->channels == 2) |
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v |= 0x01; /* stereo playback */ |
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put_byte(s->pb, v); |
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v |= 0x20; /* mp3 compressed */ |
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put_byte(s->pb, v);
put_le16(s->pb, swf->samples_per_frame); /* avg samples per frame */
put_le16(s->pb, 0); |
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|
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put_swf_end_tag(s);
}
|
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put_flush_packet(s->pb); |
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return 0;
}
|
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static int swf_write_video(AVFormatContext *s, |
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AVCodecContext *enc, const uint8_t *buf, int size) |
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{ |
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SWFContext *swf = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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|
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/* Flash Player limit */ |
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if (swf->swf_frame_number == 16000) |
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av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); |
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|
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if (enc->codec_id == CODEC_ID_VP6F ||
enc->codec_id == CODEC_ID_FLV1) { |
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if (swf->video_frame_number == 0) { |
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/* create a new video object */
put_swf_tag(s, TAG_VIDEOSTREAM);
put_le16(pb, VIDEO_ID); |
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swf->vframes_pos = url_ftell(pb); |
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put_le16(pb, 15000); /* hard flash player limit */ |
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put_le16(pb, enc->width);
put_le16(pb, enc->height);
put_byte(pb, 0); |
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put_byte(pb,codec_get_tag(swf_codec_tags,enc->codec_id)); |
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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); |
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put_le16(pb, swf->video_frame_number); |
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put_tag(pb, "video"); |
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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); |
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put_le16(pb, swf->video_frame_number); |
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put_swf_end_tag(s);
} |
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|
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/* set video frame data */
put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
put_le16(pb, VIDEO_ID); |
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put_le16(pb, swf->video_frame_number++); |
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put_buffer(pb, buf, size);
put_swf_end_tag(s); |
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} else if (enc->codec_id == CODEC_ID_MJPEG) { |
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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);
} |
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|
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put_swf_tag(s, TAG_JPEG2 | TAG_LONG); |
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|
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put_le16(pb, BITMAP_ID); /* ID of the image */ |
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|
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/* a dummy jpeg header seems to be required */ |
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put_be32(pb, 0xffd8ffd9); |
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/* write the jpeg image */
put_buffer(pb, buf, size); |
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|
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put_swf_end_tag(s); |
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|
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/* draw the shape */ |
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|
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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);
} |
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|
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swf->swf_frame_number++; |
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|
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/* streaming sound always should be placed just before showframe tags */ |
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if (swf->audio_enc && av_fifo_size(&swf->audio_fifo)) { |
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int frame_size = av_fifo_size(&swf->audio_fifo); |
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put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); |
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put_le16(pb, swf->sound_samples);
put_le16(pb, 0); // seek samples |
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av_fifo_generic_read(&swf->audio_fifo, frame_size, &put_buffer, pb); |
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put_swf_end_tag(s); |
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|
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/* update FIFO */ |
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swf->sound_samples = 0; |
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}
|
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/* output the frame */
put_swf_tag(s, TAG_SHOWFRAME);
put_swf_end_tag(s); |
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|
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put_flush_packet(s->pb); |
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|
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return 0;
}
|
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static int swf_write_audio(AVFormatContext *s, |
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AVCodecContext *enc, uint8_t *buf, int size) |
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{ |
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SWFContext *swf = s->priv_data; |
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|
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/* Flash Player limit */ |
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if (swf->swf_frame_number == 16000) |
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av_log(enc, AV_LOG_INFO, "warning: Flash Player limit of 16000 frames reached\n"); |
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|
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if (av_fifo_size(&swf->audio_fifo) + size > AUDIO_FIFO_SIZE) { |
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av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n");
return -1; |
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}
|
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av_fifo_generic_write(&swf->audio_fifo, buf, size, NULL); |
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swf->sound_samples += enc->frame_size;
|
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/* if audio only stream make sure we add swf frames */ |
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if (!swf->video_enc) |
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swf_write_video(s, enc, 0, 0); |
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return 0;
}
|
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static int swf_write_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVCodecContext *codec = s->streams[pkt->stream_index]->codec; |
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if (codec->codec_type == CODEC_TYPE_AUDIO) |
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return swf_write_audio(s, codec, pkt->data, pkt->size); |
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else |
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return swf_write_video(s, codec, pkt->data, pkt->size); |
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}
static int swf_write_trailer(AVFormatContext *s)
{
SWFContext *swf = s->priv_data; |
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ByteIOContext *pb = s->pb; |
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AVCodecContext *enc, *video_enc;
int file_size, i;
video_enc = NULL;
for(i=0;i<s->nb_streams;i++) { |
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enc = s->streams[i]->codec; |
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if (enc->codec_type == CODEC_TYPE_VIDEO)
video_enc = enc; |
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else
av_fifo_free(&swf->audio_fifo); |
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}
put_swf_tag(s, TAG_END);
put_swf_end_tag(s); |
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|
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put_flush_packet(s->pb); |
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/* patch file size and number of frames if not streamed */ |
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if (!url_is_streamed(s->pb) && video_enc) { |
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file_size = url_ftell(pb);
url_fseek(pb, 4, SEEK_SET);
put_le32(pb, file_size);
url_fseek(pb, swf->duration_pos, SEEK_SET); |
efb53331 |
put_le16(pb, swf->video_frame_number); |
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url_fseek(pb, swf->vframes_pos, SEEK_SET);
put_le16(pb, swf->video_frame_number); |
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url_fseek(pb, file_size, SEEK_SET); |
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}
return 0;
}
|
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#if CONFIG_SWF_MUXER |
ff70e601 |
AVOutputFormat swf_muxer = { |
de6d9b64 |
"swf", |
bde15e74 |
NULL_IF_CONFIG_SMALL("Flash format"), |
de6d9b64 |
"application/x-shockwave-flash",
"swf", |
c9a65ca8 |
sizeof(SWFContext), |
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CODEC_ID_MP3,
CODEC_ID_FLV1, |
de6d9b64 |
swf_write_header,
swf_write_packet,
swf_write_trailer,
}; |
ff70e601 |
#endif |
b250f9c6 |
#if CONFIG_AVM2_MUXER |
dfb400a8 |
AVOutputFormat avm2_muxer = {
"avm2", |
bde15e74 |
NULL_IF_CONFIG_SMALL("Flash 9 (AVM2) format"), |
dfb400a8 |
"application/x-shockwave-flash", |
afecbec2 |
NULL, |
dfb400a8 |
sizeof(SWFContext),
CODEC_ID_MP3,
CODEC_ID_FLV1,
swf_write_header,
swf_write_packet,
swf_write_trailer,
};
#endif |