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383 lines
11 KiB
383 lines
11 KiB
/* |
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* FLV encoder. |
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* Copyright (c) 2003 The FFmpeg Project. |
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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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#define VIDEO_FIFO_SIZE 512 |
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typedef struct FLVFrame { |
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int type; |
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int timestamp; |
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int flags; |
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uint8_t *data; |
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int size; |
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struct FLVFrame *next; |
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} FLVFrame; |
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typedef struct FLVContext { |
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int hasAudio; |
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int hasVideo; |
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#ifdef CONFIG_MP3LAME |
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int audioTime; |
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int audioInPos; |
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int audioOutPos; |
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int audioSize; |
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int audioRate; |
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int initDelay; |
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int soundDelay; |
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uint8_t *audioFifo; |
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int64_t sampleCount; |
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#endif // CONFIG_MP3LAME |
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int64_t frameCount; |
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FLVFrame *frames; |
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} FLVContext; |
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#ifdef CONFIG_MP3LAME |
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#define AUDIO_FIFO_SIZE 65536 |
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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 mp3info(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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if ( !isPadded ) { |
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printf("Fatal error: mp3 data is not padded!\n"); |
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exit(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 ) * bitsPerSlot); |
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return 1; |
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} |
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#endif // CONFIG_MP3LAME |
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static int flv_write_header(AVFormatContext *s) |
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{ |
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ByteIOContext *pb = &s->pb; |
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FLVContext *flv = s->priv_data; |
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av_set_pts_info(s, 24, 1, 1000); /* 24 bit pts in ms */ |
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flv->hasAudio = 0; |
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flv->hasVideo = 0; |
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#ifdef CONFIG_MP3LAME |
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flv->audioTime = -1; |
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flv->audioFifo = av_malloc(AUDIO_FIFO_SIZE); |
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flv->audioInPos = 0; |
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flv->audioOutPos = 0; |
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flv->audioSize = 0; |
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flv->audioRate = 44100; |
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flv->initDelay = -1; |
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flv->soundDelay = 0; |
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#endif // CONFIG_MP3LAME |
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flv->frames = 0; |
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put_tag(pb,"FLV"); |
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put_byte(pb,1); |
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put_byte(pb,0); // delayed write |
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put_be32(pb,9); |
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put_be32(pb,0); |
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return 0; |
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} |
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static void put_be24(ByteIOContext *pb, int value) |
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{ |
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put_byte(pb, (value>>16) & 0xFF ); |
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put_byte(pb, (value>> 8) & 0xFF ); |
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put_byte(pb, (value>> 0) & 0xFF ); |
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} |
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static void InsertSorted(FLVContext *flv, FLVFrame *frame) |
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{ |
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if ( !flv->frames ) { |
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flv->frames = frame; |
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} else { |
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FLVFrame *trav = flv->frames; |
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FLVFrame *prev = 0; |
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for (;trav;) { |
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if ( trav->timestamp >= frame->timestamp ) { |
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frame->next = trav; |
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if ( prev ) { |
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prev->next = frame; |
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} else { |
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flv->frames = frame; |
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} |
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break; |
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} |
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prev = trav; |
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trav = trav->next; |
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} |
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if ( !trav ) { |
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prev->next = frame; |
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} |
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} |
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} |
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static void DumpFrame(ByteIOContext *pb, FLVFrame *frame) |
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{ |
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put_byte(pb,frame->type); // message type |
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put_be24(pb,frame->size+1); // include flags |
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put_be24(pb,frame->timestamp); // time stamp |
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put_be32(pb,0); // reserved |
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put_byte(pb,frame->flags); |
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put_buffer(pb, frame->data, frame->size); |
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put_be32(pb,frame->size+1+11); // reserved |
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av_free(frame->data); |
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} |
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static void Dump(FLVContext *flv, ByteIOContext *pb, int count) |
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{ |
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int c=0; |
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FLVFrame *trav = flv->frames; |
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FLVFrame *prev = 0; |
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for (;trav;c++) { |
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trav = trav->next; |
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} |
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trav = flv->frames; |
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for ( ; c >= count; c-- ) { |
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DumpFrame(pb,trav); |
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prev = trav; |
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trav = trav->next; |
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av_free(prev); |
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} |
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flv->frames = trav; |
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} |
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static int flv_write_trailer(AVFormatContext *s) |
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{ |
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int64_t file_size; |
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int flags = 0; |
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ByteIOContext *pb = &s->pb; |
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FLVContext *flv = s->priv_data; |
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Dump(flv,pb,1); |
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file_size = url_ftell(pb); |
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flags |= flv->hasAudio ? 4 : 0; |
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flags |= flv->hasVideo ? 1 : 0; |
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url_fseek(pb, 4, SEEK_SET); |
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put_byte(pb,flags); |
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url_fseek(pb, file_size, SEEK_SET); |
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return 0; |
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} |
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static int flv_write_packet(AVFormatContext *s, int stream_index, |
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uint8_t *buf, int size, int timestamp) |
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{ |
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ByteIOContext *pb = &s->pb; |
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AVCodecContext *enc = &s->streams[stream_index]->codec; |
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FLVContext *flv = s->priv_data; |
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if (enc->codec_type == CODEC_TYPE_VIDEO) { |
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FLVFrame *frame = av_malloc(sizeof(FLVFrame)); |
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frame->next = 0; |
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frame->type = 9; |
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frame->flags = 2; // choose h263 |
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frame->flags |= enc->coded_frame->key_frame ? 0x10 : 0x20; // add keyframe indicator |
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frame->timestamp = timestamp; |
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//frame->timestamp = ( ( flv->frameCount * (int64_t)FRAME_RATE_BASE * (int64_t)1000 ) / (int64_t)enc->frame_rate ); |
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//printf("%08x %f %f\n",frame->timestamp,(double)enc->frame_rate/(double)FRAME_RATE_BASE,1000*(double)FRAME_RATE_BASE/(double)enc->frame_rate); |
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frame->size = size; |
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frame->data = av_malloc(size); |
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memcpy(frame->data,buf,size); |
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flv->hasVideo = 1; |
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InsertSorted(flv,frame); |
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flv->frameCount ++; |
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} |
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else if (enc->codec_type == CODEC_TYPE_AUDIO) { |
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#ifdef CONFIG_MP3LAME |
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if (enc->codec_id == CODEC_ID_MP3LAME ) { |
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int c=0; |
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for (;c<size;c++) { |
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flv->audioFifo[(flv->audioOutPos+c)%AUDIO_FIFO_SIZE] = buf[c]; |
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} |
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flv->audioSize += size; |
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flv->audioOutPos += size; |
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flv->audioOutPos %= AUDIO_FIFO_SIZE; |
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if ( flv->initDelay == -1 ) { |
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flv->initDelay = timestamp; |
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} |
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if ( flv->audioTime == -1 ) { |
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flv->audioTime = timestamp; |
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// flv->audioTime = ( ( ( flv->sampleCount - enc->delay ) * 8000 ) / flv->audioRate ) - flv->initDelay - 250; |
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// if ( flv->audioTime < 0 ) { |
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// flv->audioTime = 0; |
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// } |
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} |
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} |
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for ( ; flv->audioSize >= 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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if ( mp3info(&flv->audioFifo[flv->audioInPos],&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono) ) { |
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if ( flv->audioSize >= mp3FrameSize ) { |
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int soundFormat = 0x22; |
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int c=0; |
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FLVFrame *frame = av_malloc(sizeof(FLVFrame)); |
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flv->audioRate = mp3SampleRate; |
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switch (mp3SampleRate) { |
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case 44100: |
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soundFormat |= 0x0C; |
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break; |
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case 22050: |
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soundFormat |= 0x08; |
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break; |
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case 11025: |
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soundFormat |= 0x04; |
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break; |
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} |
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if ( !mp3IsMono ) { |
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soundFormat |= 0x01; |
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} |
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frame->next = 0; |
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frame->type = 8; |
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frame->flags = soundFormat; |
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frame->timestamp = flv->audioTime; |
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frame->size = mp3FrameSize; |
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frame->data = av_malloc(mp3FrameSize); |
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for (;c<mp3FrameSize;c++) { |
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frame->data[c] = flv->audioFifo[(flv->audioInPos+c)%AUDIO_FIFO_SIZE]; |
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} |
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flv->audioInPos += mp3FrameSize; |
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flv->audioSize -= mp3FrameSize; |
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flv->audioInPos %= AUDIO_FIFO_SIZE; |
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flv->sampleCount += mp3SamplesPerFrame; |
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// Reset audio for next round |
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flv->audioTime = -1; |
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// We got audio! Make sure we set this to the global flags on closure |
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flv->hasAudio = 1; |
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InsertSorted(flv,frame); |
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} |
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break; |
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} |
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flv->audioInPos ++; |
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flv->audioSize --; |
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flv->audioInPos %= AUDIO_FIFO_SIZE; |
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// no audio in here! |
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flv->audioTime = -1; |
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} |
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#endif |
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} |
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Dump(flv,pb,128); |
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put_flush_packet(pb); |
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return 0; |
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} |
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static AVOutputFormat flv_oformat = { |
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"flv", |
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"flv format", |
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"video/x-flashvideo", |
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"flv", |
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sizeof(FLVContext), |
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#ifdef CONFIG_MP3LAME |
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CODEC_ID_MP3LAME, |
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#else // CONFIG_MP3LAME |
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CODEC_ID_NONE, |
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#endif // CONFIG_MP3LAME |
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CODEC_ID_FLV1, |
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flv_write_header, |
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flv_write_packet, |
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flv_write_trailer, |
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}; |
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int flvenc_init(void) |
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{ |
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av_register_output_format(&flv_oformat); |
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return 0; |
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}
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