935 lines
27 KiB
C
935 lines
27 KiB
C
/*
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* Flash Compatible Streaming Format
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#include "bitstream.h"
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/* should have a generic way to indicate probable size */
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#define DUMMY_FILE_SIZE (100 * 1024 * 1024)
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#define DUMMY_DURATION 600 /* in seconds */
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#define TAG_END 0
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#define TAG_SHOWFRAME 1
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#define TAG_DEFINESHAPE 2
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#define TAG_FREECHARACTER 3
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#define TAG_PLACEOBJECT 4
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#define TAG_REMOVEOBJECT 5
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#define TAG_STREAMHEAD 18
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#define TAG_STREAMBLOCK 19
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#define TAG_JPEG2 21
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#define TAG_PLACEOBJECT2 26
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#define TAG_STREAMHEAD2 45
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#define TAG_VIDEOSTREAM 60
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#define TAG_VIDEOFRAME 61
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#define TAG_LONG 0x100
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/* flags for shape definition */
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#define FLAG_MOVETO 0x01
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#define FLAG_SETFILL0 0x02
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#define FLAG_SETFILL1 0x04
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#define SWF_VIDEO_CODEC_FLV1 0x02
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#define AUDIO_FIFO_SIZE 65536
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/* character id used */
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#define BITMAP_ID 0
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#define VIDEO_ID 0
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#define SHAPE_ID 1
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#undef NDEBUG
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#include <assert.h>
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typedef struct {
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offset_t duration_pos;
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offset_t tag_pos;
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int samples_per_frame;
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int sound_samples;
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int video_samples;
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int swf_frame_number;
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int video_frame_number;
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int ms_per_frame;
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int ch_id;
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int tag;
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uint8_t *audio_fifo;
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int audio_in_pos;
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int audio_out_pos;
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int audio_size;
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int video_type;
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int audio_type;
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} SWFContext;
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static const int sSampleRates[3][4] = {
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{44100, 48000, 32000, 0},
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{22050, 24000, 16000, 0},
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{11025, 12000, 8000, 0},
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};
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static const int sBitRates[2][3][15] = {
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{ { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
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{ 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
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{ 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
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},
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{ { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
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},
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};
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static const int sSamplesPerFrame[3][3] =
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{
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{ 384, 1152, 1152 },
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{ 384, 1152, 576 },
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{ 384, 1152, 576 }
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};
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static const int sBitsPerSlot[3] = {
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32,
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8,
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8
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};
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static int swf_mp3_info(void *data, int *byteSize, int *samplesPerFrame, int *sampleRate, int *isMono )
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{
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uint8_t *dataTmp = (uint8_t *)data;
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uint32_t header = ( (uint32_t)dataTmp[0] << 24 ) | ( (uint32_t)dataTmp[1] << 16 ) | ( (uint32_t)dataTmp[2] << 8 ) | (uint32_t)dataTmp[3];
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int layerID = 3 - ((header >> 17) & 0x03);
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int bitRateID = ((header >> 12) & 0x0f);
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int sampleRateID = ((header >> 10) & 0x03);
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int bitRate = 0;
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int bitsPerSlot = sBitsPerSlot[layerID];
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int isPadded = ((header >> 9) & 0x01);
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if ( (( header >> 21 ) & 0x7ff) != 0x7ff ) {
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return 0;
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}
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*isMono = ((header >> 6) & 0x03) == 0x03;
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if ( (header >> 19 ) & 0x01 ) {
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*sampleRate = sSampleRates[0][sampleRateID];
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bitRate = sBitRates[0][layerID][bitRateID] * 1000;
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*samplesPerFrame = sSamplesPerFrame[0][layerID];
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} else {
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if ( (header >> 20) & 0x01 ) {
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*sampleRate = sSampleRates[1][sampleRateID];
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bitRate = sBitRates[1][layerID][bitRateID] * 1000;
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*samplesPerFrame = sSamplesPerFrame[1][layerID];
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} else {
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*sampleRate = sSampleRates[2][sampleRateID];
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bitRate = sBitRates[1][layerID][bitRateID] * 1000;
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*samplesPerFrame = sSamplesPerFrame[2][layerID];
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}
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}
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*byteSize = ( ( ( ( *samplesPerFrame * (bitRate / bitsPerSlot) ) / *sampleRate ) + isPadded ) );
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return 1;
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}
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#ifdef CONFIG_ENCODERS
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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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ByteIOContext *pb = &s->pb;
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swf->tag_pos = url_ftell(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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put_le16(pb, 0);
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put_le32(pb, 0);
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} else {
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put_le16(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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ByteIOContext *pb = &s->pb;
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offset_t pos;
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int tag_len, tag;
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pos = url_ftell(pb);
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tag_len = pos - swf->tag_pos - 2;
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tag = swf->tag;
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url_fseek(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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put_le16(pb, (tag << 6) | 0x3f);
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put_le32(pb, tag_len - 4);
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} else {
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assert(tag_len < 0x3f);
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put_le16(pb, (tag << 6) | tag_len);
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}
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url_fseek(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(ByteIOContext *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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put_buffer(pb, buf, pbBufPtr(&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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/* put matrix */
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static void put_swf_matrix(ByteIOContext *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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put_buffer(pb, buf, pbBufPtr(&p) - p.buf);
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}
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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;
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ByteIOContext *pb = &s->pb;
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AVCodecContext *enc, *audio_enc, *video_enc;
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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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swf = av_malloc(sizeof(SWFContext));
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if (!swf)
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return -1;
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s->priv_data = swf;
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swf->ch_id = -1;
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swf->audio_in_pos = 0;
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swf->audio_out_pos = 0;
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swf->audio_size = 0;
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swf->audio_fifo = av_malloc(AUDIO_FIFO_SIZE);
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swf->sound_samples = 0;
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swf->video_samples = 0;
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swf->swf_frame_number = 0;
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swf->video_frame_number = 0;
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video_enc = NULL;
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audio_enc = NULL;
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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_AUDIO)
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audio_enc = enc;
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else {
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if ( enc->codec_id == CODEC_ID_FLV1 || enc->codec_id == CODEC_ID_MJPEG ) {
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video_enc = enc;
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} else {
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av_log(enc, AV_LOG_ERROR, "SWF only supports 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 (!video_enc) {
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/* currenty, cannot work correctly if audio only */
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swf->video_type = 0;
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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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swf->video_type = video_enc->codec_id;
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width = video_enc->width;
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height = video_enc->height;
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rate = video_enc->time_base.den;
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rate_base = video_enc->time_base.num;
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}
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if (!audio_enc ) {
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swf->audio_type = 0;
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swf->samples_per_frame = ( 44100. * rate_base ) / rate;
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} else {
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swf->audio_type = audio_enc->codec_id;
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swf->samples_per_frame = ( ( audio_enc->sample_rate ) * rate_base ) / rate;
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}
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put_tag(pb, "FWS");
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if ( video_enc && video_enc->codec_id == CODEC_ID_FLV1 ) {
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put_byte(pb, 6); /* version (version 6 and above support FLV1 codec) */
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} else {
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put_byte(pb, 4); /* version (should use 4 for mpeg audio support) */
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}
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put_le32(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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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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/* define a shape with the jpeg inside */
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if ( video_enc && video_enc->codec_id == CODEC_ID_FLV1 ) {
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} else if ( video_enc && video_enc->codec_id == CODEC_ID_MJPEG ) {
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put_swf_tag(s, TAG_DEFINESHAPE);
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put_le16(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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put_byte(pb, 1); /* one fill style */
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put_byte(pb, 0x41); /* clipped bitmap fill */
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put_le16(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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put_byte(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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put_buffer(pb, buf1, pbBufPtr(&p) - p.buf);
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put_swf_end_tag(s);
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}
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if (audio_enc && audio_enc->codec_id == CODEC_ID_MP3 ) {
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int v;
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/* start sound */
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put_swf_tag(s, TAG_STREAMHEAD2);
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v = 0;
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switch(audio_enc->sample_rate) {
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case 11025:
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v |= 1 << 2;
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break;
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case 22050:
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v |= 2 << 2;
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break;
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case 44100:
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v |= 3 << 2;
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break;
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default:
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/* not supported */
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av_free(swf->audio_fifo);
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av_free(swf);
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return -1;
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}
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v |= 0x02; /* 16 bit playback */
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if (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);
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put_le16(&s->pb, swf->samples_per_frame); /* avg samples per frame */
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put_le16(&s->pb, 0);
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put_swf_end_tag(s);
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}
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put_flush_packet(&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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ByteIOContext *pb = &s->pb;
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int c = 0;
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int outSize = 0;
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int outSamples = 0;
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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 ( swf->audio_type ) {
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/* Prescan audio data for this swf frame */
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retry_swf_audio_packet:
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if ( ( swf->audio_size-outSize ) >= 4 ) {
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int mp3FrameSize = 0;
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int mp3SampleRate = 0;
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int mp3IsMono = 0;
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int mp3SamplesPerFrame = 0;
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/* copy out mp3 header from ring buffer */
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uint8_t header[4];
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for (c=0; c<4; c++) {
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header[c] = swf->audio_fifo[(swf->audio_in_pos+outSize+c) % AUDIO_FIFO_SIZE];
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}
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if ( swf_mp3_info(header,&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono) ) {
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if ( ( swf->audio_size-outSize ) >= mp3FrameSize ) {
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outSize += mp3FrameSize;
|
|
outSamples += mp3SamplesPerFrame;
|
|
if ( ( swf->sound_samples + outSamples + swf->samples_per_frame ) < swf->video_samples ) {
|
|
goto retry_swf_audio_packet;
|
|
}
|
|
}
|
|
} else {
|
|
/* invalid mp3 data, skip forward
|
|
we need to do this since the Flash Player
|
|
does not like custom headers */
|
|
swf->audio_in_pos ++;
|
|
swf->audio_size --;
|
|
swf->audio_in_pos %= AUDIO_FIFO_SIZE;
|
|
goto retry_swf_audio_packet;
|
|
}
|
|
}
|
|
|
|
/* audio stream is behind video stream, bail */
|
|
if ( ( swf->sound_samples + outSamples + swf->samples_per_frame ) < swf->video_samples ) {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if ( swf->video_type == 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);
|
|
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, SWF_VIDEO_CODEC_FLV1);
|
|
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_byte(pb, 'v');
|
|
put_byte(pb, 'i');
|
|
put_byte(pb, 'd');
|
|
put_byte(pb, 'e');
|
|
put_byte(pb, 'o');
|
|
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 ( swf->video_type == 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_byte(pb, 0xff);
|
|
put_byte(pb, 0xd8);
|
|
put_byte(pb, 0xff);
|
|
put_byte(pb, 0xd9);
|
|
/* 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);
|
|
} else {
|
|
/* invalid codec */
|
|
}
|
|
|
|
swf->swf_frame_number ++;
|
|
|
|
swf->video_samples += swf->samples_per_frame;
|
|
|
|
/* streaming sound always should be placed just before showframe tags */
|
|
if ( outSize > 0 ) {
|
|
put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG);
|
|
put_le16(pb, outSamples);
|
|
put_le16(pb, 0);
|
|
for (c=0; c<outSize; c++) {
|
|
put_byte(pb,swf->audio_fifo[(swf->audio_in_pos+c) % AUDIO_FIFO_SIZE]);
|
|
}
|
|
put_swf_end_tag(s);
|
|
|
|
/* update FIFO */
|
|
swf->sound_samples += outSamples;
|
|
swf->audio_in_pos += outSize;
|
|
swf->audio_size -= outSize;
|
|
swf->audio_in_pos %= AUDIO_FIFO_SIZE;
|
|
}
|
|
|
|
/* 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_audio(AVFormatContext *s,
|
|
AVCodecContext *enc, const uint8_t *buf, int size)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
int c = 0;
|
|
|
|
/* 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_MP3 ) {
|
|
for (c=0; c<size; c++) {
|
|
swf->audio_fifo[(swf->audio_out_pos+c)%AUDIO_FIFO_SIZE] = buf[c];
|
|
}
|
|
swf->audio_size += size;
|
|
swf->audio_out_pos += size;
|
|
swf->audio_out_pos %= AUDIO_FIFO_SIZE;
|
|
}
|
|
|
|
/* if audio only stream make sure we add swf frames */
|
|
if ( swf->video_type == 0 ) {
|
|
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 == CODEC_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;
|
|
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;
|
|
}
|
|
|
|
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, video_enc->frame_number);
|
|
}
|
|
|
|
av_free(swf->audio_fifo);
|
|
|
|
return 0;
|
|
}
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
/*********************************************/
|
|
/* Extract FLV encoded frame and MP3 from swf
|
|
Note that the detection of the real frame
|
|
is inaccurate at this point as it can be
|
|
quite tricky to determine, you almost certainly
|
|
will get a bad audio/video sync */
|
|
|
|
static int get_swf_tag(ByteIOContext *pb, int *len_ptr)
|
|
{
|
|
int tag, len;
|
|
|
|
if (url_feof(pb))
|
|
return -1;
|
|
|
|
tag = get_le16(pb);
|
|
len = tag & 0x3f;
|
|
tag = tag >> 6;
|
|
if (len == 0x3f) {
|
|
len = get_le32(pb);
|
|
}
|
|
// av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
|
|
*len_ptr = len;
|
|
return tag;
|
|
}
|
|
|
|
|
|
static int swf_probe(AVProbeData *p)
|
|
{
|
|
/* check file header */
|
|
if (p->buf_size <= 16)
|
|
return 0;
|
|
if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
|
|
p->buf[2] == 'S')
|
|
return AVPROBE_SCORE_MAX;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
SWFContext *swf = 0;
|
|
ByteIOContext *pb = &s->pb;
|
|
int nbits, len, frame_rate, tag, v;
|
|
offset_t firstTagOff;
|
|
AVStream *ast = 0;
|
|
AVStream *vst = 0;
|
|
|
|
swf = av_malloc(sizeof(SWFContext));
|
|
if (!swf)
|
|
return -1;
|
|
s->priv_data = swf;
|
|
|
|
tag = get_be32(pb) & 0xffffff00;
|
|
|
|
if (tag == MKBETAG('C', 'W', 'S', 0))
|
|
{
|
|
av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
|
|
return AVERROR_IO;
|
|
}
|
|
if (tag != MKBETAG('F', 'W', 'S', 0))
|
|
return AVERROR_IO;
|
|
get_le32(pb);
|
|
/* skip rectangle size */
|
|
nbits = get_byte(pb) >> 3;
|
|
len = (4 * nbits - 3 + 7) / 8;
|
|
url_fskip(pb, len);
|
|
frame_rate = get_le16(pb);
|
|
get_le16(pb); /* frame count */
|
|
|
|
/* The Flash Player converts 8.8 frame rates
|
|
to milliseconds internally. Do the same to get
|
|
a correct framerate */
|
|
swf->ms_per_frame = ( 1000 * 256 ) / frame_rate;
|
|
swf->samples_per_frame = 0;
|
|
swf->ch_id = -1;
|
|
|
|
firstTagOff = url_ftell(pb);
|
|
for(;;) {
|
|
tag = get_swf_tag(pb, &len);
|
|
if (tag < 0) {
|
|
if ( ast || vst ) {
|
|
if ( vst && ast ) {
|
|
vst->codec->time_base.den = ast->codec->sample_rate / swf->samples_per_frame;
|
|
vst->codec->time_base.num = 1;
|
|
}
|
|
break;
|
|
}
|
|
av_log(s, AV_LOG_ERROR, "No media found in SWF\n");
|
|
return AVERROR_IO;
|
|
}
|
|
if ( tag == TAG_VIDEOSTREAM && !vst) {
|
|
swf->ch_id = get_le16(pb);
|
|
get_le16(pb);
|
|
get_le16(pb);
|
|
get_le16(pb);
|
|
get_byte(pb);
|
|
/* Check for FLV1 */
|
|
if ( get_byte(pb) == SWF_VIDEO_CODEC_FLV1 ) {
|
|
vst = av_new_stream(s, 0);
|
|
av_set_pts_info(vst, 24, 1, 1000); /* 24 bit pts in ms */
|
|
|
|
vst->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
vst->codec->codec_id = CODEC_ID_FLV1;
|
|
if ( swf->samples_per_frame ) {
|
|
vst->codec->time_base.den = 1000. / swf->ms_per_frame;
|
|
vst->codec->time_base.num = 1;
|
|
}
|
|
}
|
|
} else if ( ( tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2 ) && !ast) {
|
|
/* streaming found */
|
|
get_byte(pb);
|
|
v = get_byte(pb);
|
|
swf->samples_per_frame = get_le16(pb);
|
|
if (len!=4)
|
|
url_fskip(pb,len-4);
|
|
/* if mp3 streaming found, OK */
|
|
if ((v & 0x20) != 0) {
|
|
if ( tag == TAG_STREAMHEAD2 ) {
|
|
get_le16(pb);
|
|
}
|
|
ast = av_new_stream(s, 1);
|
|
av_set_pts_info(ast, 24, 1, 1000); /* 24 bit pts in ms */
|
|
if (!ast)
|
|
return -ENOMEM;
|
|
|
|
if (v & 0x01)
|
|
ast->codec->channels = 2;
|
|
else
|
|
ast->codec->channels = 1;
|
|
|
|
switch((v>> 2) & 0x03) {
|
|
case 1:
|
|
ast->codec->sample_rate = 11025;
|
|
break;
|
|
case 2:
|
|
ast->codec->sample_rate = 22050;
|
|
break;
|
|
case 3:
|
|
ast->codec->sample_rate = 44100;
|
|
break;
|
|
default:
|
|
av_free(ast);
|
|
return AVERROR_IO;
|
|
}
|
|
ast->codec->codec_type = CODEC_TYPE_AUDIO;
|
|
ast->codec->codec_id = CODEC_ID_MP3;
|
|
}
|
|
} else {
|
|
url_fskip(pb, len);
|
|
}
|
|
}
|
|
url_fseek(pb, firstTagOff, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
AVStream *st = 0;
|
|
int tag, len, i, frame;
|
|
|
|
for(;;) {
|
|
tag = get_swf_tag(pb, &len);
|
|
if (tag < 0)
|
|
return AVERROR_IO;
|
|
if (tag == TAG_VIDEOFRAME) {
|
|
for( i=0; i<s->nb_streams; i++ ) {
|
|
st = s->streams[i];
|
|
if (st->id == 0) {
|
|
if ( get_le16(pb) == swf->ch_id ) {
|
|
frame = get_le16(pb);
|
|
av_get_packet(pb, pkt, len-4);
|
|
pkt->pts = frame * swf->ms_per_frame;
|
|
pkt->stream_index = st->index;
|
|
return pkt->size;
|
|
} else {
|
|
url_fskip(pb, len-2);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
url_fskip(pb, len);
|
|
} else if (tag == TAG_STREAMBLOCK) {
|
|
for( i=0; i<s->nb_streams; i++ ) {
|
|
st = s->streams[i];
|
|
if (st->id == 1) {
|
|
av_get_packet(pb, pkt, len);
|
|
pkt->stream_index = st->index;
|
|
return pkt->size;
|
|
}
|
|
}
|
|
url_fskip(pb, len);
|
|
} else {
|
|
url_fskip(pb, len);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int swf_read_close(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat swf_iformat = {
|
|
"swf",
|
|
"Flash format",
|
|
sizeof(SWFContext),
|
|
swf_probe,
|
|
swf_read_header,
|
|
swf_read_packet,
|
|
swf_read_close,
|
|
};
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
static AVOutputFormat swf_oformat = {
|
|
"swf",
|
|
"Flash format",
|
|
"application/x-shockwave-flash",
|
|
"swf",
|
|
sizeof(SWFContext),
|
|
CODEC_ID_MP3,
|
|
CODEC_ID_FLV1,
|
|
swf_write_header,
|
|
swf_write_packet,
|
|
swf_write_trailer,
|
|
};
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
int swf_init(void)
|
|
{
|
|
av_register_input_format(&swf_iformat);
|
|
#ifdef CONFIG_ENCODERS
|
|
av_register_output_format(&swf_oformat);
|
|
#endif //CONFIG_ENCODERS
|
|
return 0;
|
|
}
|