539 lines
16 KiB
C
539 lines
16 KiB
C
/*
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* Flash Compatible Streaming Format muxer
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* Copyright (c) 2000 Fabrice Bellard
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* Copyright (c) 2003 Tinic Uro
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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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* Libav 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
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* 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 Libav; 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/put_bits.h"
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#include "avformat.h"
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#include "swf.h"
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static void put_swf_tag(AVFormatContext *s, int tag)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *pb = s->pb;
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swf->tag_pos = avio_tell(pb);
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swf->tag = tag;
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/* reserve some room for the tag */
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if (tag & TAG_LONG) {
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avio_wl16(pb, 0);
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avio_wl32(pb, 0);
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} else {
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avio_wl16(pb, 0);
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}
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}
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static void put_swf_end_tag(AVFormatContext *s)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *pb = s->pb;
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int64_t pos;
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int tag_len, tag;
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pos = avio_tell(pb);
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tag_len = pos - swf->tag_pos - 2;
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tag = swf->tag;
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avio_seek(pb, swf->tag_pos, SEEK_SET);
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if (tag & TAG_LONG) {
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tag &= ~TAG_LONG;
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avio_wl16(pb, (tag << 6) | 0x3f);
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avio_wl32(pb, tag_len - 4);
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} else {
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assert(tag_len < 0x3f);
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avio_wl16(pb, (tag << 6) | tag_len);
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}
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avio_seek(pb, pos, SEEK_SET);
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}
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static inline void max_nbits(int *nbits_ptr, int val)
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{
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int n;
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if (val == 0)
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return;
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val = abs(val);
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n = 1;
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while (val != 0) {
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n++;
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val >>= 1;
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}
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if (n > *nbits_ptr)
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*nbits_ptr = n;
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}
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static void put_swf_rect(AVIOContext *pb,
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int xmin, int xmax, int ymin, int ymax)
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{
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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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nbits = 0;
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max_nbits(&nbits, xmin);
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max_nbits(&nbits, xmax);
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max_nbits(&nbits, ymin);
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max_nbits(&nbits, ymax);
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mask = (1 << nbits) - 1;
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/* rectangle info */
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put_bits(&p, 5, nbits);
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put_bits(&p, nbits, xmin & mask);
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put_bits(&p, nbits, xmax & mask);
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put_bits(&p, nbits, ymin & mask);
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put_bits(&p, nbits, ymax & mask);
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flush_put_bits(&p);
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avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
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}
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static void put_swf_line_edge(PutBitContext *pb, int dx, int dy)
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{
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int nbits, mask;
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put_bits(pb, 1, 1); /* edge */
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put_bits(pb, 1, 1); /* line select */
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nbits = 2;
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max_nbits(&nbits, dx);
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max_nbits(&nbits, dy);
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mask = (1 << nbits) - 1;
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put_bits(pb, 4, nbits - 2); /* 16 bits precision */
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if (dx == 0) {
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put_bits(pb, 1, 0);
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put_bits(pb, 1, 1);
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put_bits(pb, nbits, dy & mask);
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} else if (dy == 0) {
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put_bits(pb, 1, 0);
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put_bits(pb, 1, 0);
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put_bits(pb, nbits, dx & mask);
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} else {
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put_bits(pb, 1, 1);
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put_bits(pb, nbits, dx & mask);
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put_bits(pb, nbits, dy & mask);
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}
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}
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#define FRAC_BITS 16
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static void put_swf_matrix(AVIOContext *pb,
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int a, int b, int c, int d, int tx, int ty)
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{
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PutBitContext p;
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uint8_t buf[256];
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int nbits;
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init_put_bits(&p, buf, sizeof(buf));
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put_bits(&p, 1, 1); /* a, d present */
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nbits = 1;
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max_nbits(&nbits, a);
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max_nbits(&nbits, d);
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put_bits(&p, 5, nbits); /* nb bits */
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put_bits(&p, nbits, a);
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put_bits(&p, nbits, d);
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put_bits(&p, 1, 1); /* b, c present */
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nbits = 1;
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max_nbits(&nbits, c);
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max_nbits(&nbits, b);
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put_bits(&p, 5, nbits); /* nb bits */
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put_bits(&p, nbits, c);
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put_bits(&p, nbits, b);
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nbits = 1;
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max_nbits(&nbits, tx);
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max_nbits(&nbits, ty);
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put_bits(&p, 5, nbits); /* nb bits */
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put_bits(&p, nbits, tx);
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put_bits(&p, nbits, ty);
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flush_put_bits(&p);
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avio_write(pb, buf, put_bits_ptr(&p) - p.buf);
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}
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static int swf_write_header(AVFormatContext *s)
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{
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SWFContext *swf = s->priv_data;
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AVIOContext *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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swf->sound_samples = 0;
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swf->swf_frame_number = 0;
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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 == AVMEDIA_TYPE_AUDIO) {
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if (swf->audio_enc) {
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av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 audio stream\n");
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return AVERROR_INVALIDDATA;
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}
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if (enc->codec_id == AV_CODEC_ID_MP3) {
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swf->audio_enc = enc;
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swf->audio_fifo= av_fifo_alloc(AUDIO_FIFO_SIZE);
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if (!swf->audio_fifo)
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return AVERROR(ENOMEM);
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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;
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}
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} else {
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if (swf->video_enc) {
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av_log(s, AV_LOG_ERROR, "SWF muxer only supports 1 video stream\n");
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return AVERROR_INVALIDDATA;
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}
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if (enc->codec_id == AV_CODEC_ID_VP6F ||
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enc->codec_id == AV_CODEC_ID_FLV1 ||
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enc->codec_id == AV_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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}
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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;
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height = 200;
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rate = 10;
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rate_base= 1;
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} else {
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width = swf->video_enc->width;
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height = swf->video_enc->height;
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rate = swf->video_enc->time_base.den;
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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
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swf->samples_per_frame = (swf->audio_enc->sample_rate * rate_base) / rate;
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avio_write(pb, "FWS", 3);
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if (!strcmp("avm2", s->oformat->name))
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version = 9;
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else if (swf->video_enc && swf->video_enc->codec_id == AV_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 == AV_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 */
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avio_w8(pb, version);
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avio_wl32(pb, DUMMY_FILE_SIZE); /* dummy size
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(will be patched if not streamed) */
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put_swf_rect(pb, 0, width * 20, 0, height * 20);
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avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
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swf->duration_pos = avio_tell(pb);
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avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */
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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);
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avio_wl32(pb, 1<<3); /* set ActionScript v3/AVM2 flag */
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put_swf_end_tag(s);
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}
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/* define a shape with the jpeg inside */
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if (swf->video_enc && swf->video_enc->codec_id == AV_CODEC_ID_MJPEG) {
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put_swf_tag(s, TAG_DEFINESHAPE);
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avio_wl16(pb, SHAPE_ID); /* ID of shape */
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/* bounding rectangle */
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put_swf_rect(pb, 0, width, 0, height);
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/* style info */
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avio_w8(pb, 1); /* one fill style */
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avio_w8(pb, 0x41); /* clipped bitmap fill */
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avio_wl16(pb, BITMAP_ID); /* bitmap ID */
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/* 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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avio_w8(pb, 0); /* no line style */
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/* shape drawing */
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init_put_bits(&p, buf1, sizeof(buf1));
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put_bits(&p, 4, 1); /* one fill bit */
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put_bits(&p, 4, 0); /* zero line bit */
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put_bits(&p, 1, 0); /* not an edge */
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put_bits(&p, 5, FLAG_MOVETO | FLAG_SETFILL0);
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put_bits(&p, 5, 1); /* nbits */
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put_bits(&p, 1, 0); /* X */
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put_bits(&p, 1, 0); /* Y */
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put_bits(&p, 1, 1); /* set fill style 1 */
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/* draw the rectangle ! */
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put_swf_line_edge(&p, width, 0);
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put_swf_line_edge(&p, 0, height);
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put_swf_line_edge(&p, -width, 0);
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put_swf_line_edge(&p, 0, -height);
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/* end of shape */
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put_bits(&p, 1, 0); /* not an edge */
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put_bits(&p, 5, 0);
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flush_put_bits(&p);
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avio_write(pb, buf1, put_bits_ptr(&p) - p.buf);
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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 == AV_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;
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case 22050: v |= 2 << 2; break;
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case 44100: v |= 3 << 2; break;
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default:
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/* 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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}
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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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avio_w8(s->pb, v);
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v |= 0x20; /* mp3 compressed */
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avio_w8(s->pb, v);
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avio_wl16(s->pb, swf->samples_per_frame); /* avg samples per frame */
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avio_wl16(s->pb, 0);
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put_swf_end_tag(s);
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}
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avio_flush(s->pb);
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return 0;
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}
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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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AVIOContext *pb = s->pb;
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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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if (enc->codec_id == AV_CODEC_ID_VP6F ||
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enc->codec_id == AV_CODEC_ID_FLV1) {
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if (swf->video_frame_number == 0) {
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/* create a new video object */
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put_swf_tag(s, TAG_VIDEOSTREAM);
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avio_wl16(pb, VIDEO_ID);
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swf->vframes_pos = avio_tell(pb);
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avio_wl16(pb, 15000); /* hard flash player limit */
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avio_wl16(pb, enc->width);
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avio_wl16(pb, enc->height);
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avio_w8(pb, 0);
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avio_w8(pb,ff_codec_get_tag(ff_swf_codec_tags, enc->codec_id));
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put_swf_end_tag(s);
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/* place the video object for the first time */
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put_swf_tag(s, TAG_PLACEOBJECT2);
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avio_w8(pb, 0x36);
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avio_wl16(pb, 1);
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avio_wl16(pb, VIDEO_ID);
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put_swf_matrix(pb, 1 << FRAC_BITS, 0, 0, 1 << FRAC_BITS, 0, 0);
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avio_wl16(pb, swf->video_frame_number);
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avio_write(pb, "video", 5);
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avio_w8(pb, 0x00);
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put_swf_end_tag(s);
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} else {
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/* mark the character for update */
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put_swf_tag(s, TAG_PLACEOBJECT2);
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avio_w8(pb, 0x11);
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avio_wl16(pb, 1);
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avio_wl16(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 */
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put_swf_tag(s, TAG_VIDEOFRAME | TAG_LONG);
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avio_wl16(pb, VIDEO_ID);
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avio_wl16(pb, swf->video_frame_number++);
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avio_write(pb, buf, size);
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put_swf_end_tag(s);
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} else if (enc->codec_id == AV_CODEC_ID_MJPEG) {
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if (swf->swf_frame_number > 0) {
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/* remove the shape */
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put_swf_tag(s, TAG_REMOVEOBJECT);
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avio_wl16(pb, SHAPE_ID); /* shape ID */
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avio_wl16(pb, 1); /* depth */
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put_swf_end_tag(s);
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/* free the bitmap */
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put_swf_tag(s, TAG_FREECHARACTER);
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avio_wl16(pb, BITMAP_ID);
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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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avio_wl16(pb, BITMAP_ID); /* ID of the image */
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/* a dummy jpeg header seems to be required */
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avio_wb32(pb, 0xffd8ffd9);
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/* write the jpeg image */
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avio_write(pb, buf, size);
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put_swf_end_tag(s);
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/* draw the shape */
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put_swf_tag(s, TAG_PLACEOBJECT);
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avio_wl16(pb, SHAPE_ID); /* shape ID */
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avio_wl16(pb, 1); /* depth */
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put_swf_matrix(pb, 20 << FRAC_BITS, 0, 0, 20 << FRAC_BITS, 0, 0);
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put_swf_end_tag(s);
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}
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swf->swf_frame_number++;
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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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avio_wl16(pb, swf->sound_samples);
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avio_wl16(pb, 0); // seek samples
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av_fifo_generic_read(swf->audio_fifo, pb, frame_size, &avio_write);
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put_swf_end_tag(s);
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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 */
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put_swf_tag(s, TAG_SHOWFRAME);
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put_swf_end_tag(s);
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avio_flush(s->pb);
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return 0;
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}
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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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/* 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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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");
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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 += av_get_audio_frame_duration(enc, 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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}
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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;
|
|
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);
|
|
}
|
|
|
|
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);
|
|
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
|