From 013e0a8f35b5551675a8c3b9a025ae34e2991b17 Mon Sep 17 00:00:00 2001 From: Baptiste Coudurier Date: Sun, 4 Mar 2007 22:30:25 +0000 Subject: simplify swf muxer Originally committed as revision 8223 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/swf.c | 162 +++++++++--------------------------------------------- 1 file changed, 26 insertions(+), 136 deletions(-) (limited to 'libavformat/swf.c') diff --git a/libavformat/swf.c b/libavformat/swf.c index 145c77cb8f..8dba80da75 100644 --- a/libavformat/swf.c +++ b/libavformat/swf.c @@ -71,7 +71,7 @@ typedef struct { int ms_per_frame; int tag; - uint8_t *audio_fifo; + uint8_t audio_fifo[AUDIO_FIFO_SIZE]; int audio_in_pos; int audio_out_pos; int audio_size; @@ -95,73 +95,6 @@ static const AVCodecTag swf_audio_codec_tags[] = { {0, 0}, }; -static const int sSampleRates[3][4] = { - {44100, 48000, 32000, 0}, - {22050, 24000, 16000, 0}, - {11025, 12000, 8000, 0}, -}; - -static const int sBitRates[2][3][15] = { - { { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448}, - { 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384}, - { 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320} - }, - { { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256}, - { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}, - { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160} - }, -}; - -static const int sSamplesPerFrame[3][3] = -{ - { 384, 1152, 1152 }, - { 384, 1152, 576 }, - { 384, 1152, 576 } -}; - -static const int sBitsPerSlot[3] = { - 32, - 8, - 8 -}; - -static int swf_mp3_info(void *data, int *byteSize, int *samplesPerFrame, int *sampleRate, int *isMono ) -{ - uint32_t header = AV_RB32(data); - int layerID = 3 - ((header >> 17) & 0x03); - int bitRateID = ((header >> 12) & 0x0f); - int sampleRateID = ((header >> 10) & 0x03); - int bitRate = 0; - int bitsPerSlot = sBitsPerSlot[layerID]; - int isPadded = ((header >> 9) & 0x01); - - if ( (( header >> 21 ) & 0x7ff) != 0x7ff ) { - return 0; - } - - *isMono = ((header >> 6) & 0x03) == 0x03; - - if ( (header >> 19 ) & 0x01 ) { - *sampleRate = sSampleRates[0][sampleRateID]; - bitRate = sBitRates[0][layerID][bitRateID] * 1000; - *samplesPerFrame = sSamplesPerFrame[0][layerID]; - } else { - if ( (header >> 20) & 0x01 ) { - *sampleRate = sSampleRates[1][sampleRateID]; - bitRate = sBitRates[1][layerID][bitRateID] * 1000; - *samplesPerFrame = sSamplesPerFrame[1][layerID]; - } else { - *sampleRate = sSampleRates[2][sampleRateID]; - bitRate = sBitRates[1][layerID][bitRateID] * 1000; - *samplesPerFrame = sSamplesPerFrame[2][layerID]; - } - } - - *byteSize = ( ( ( ( *samplesPerFrame * (bitRate / bitsPerSlot) ) / *sampleRate ) + isPadded ) ); - - return 1; -} - #ifdef CONFIG_MUXERS static void put_swf_tag(AVFormatContext *s, int tag) { @@ -323,7 +256,6 @@ static int swf_write_header(AVFormatContext *s) swf->audio_in_pos = 0; swf->audio_out_pos = 0; swf->audio_size = 0; - swf->audio_fifo = av_malloc(AUDIO_FIFO_SIZE); swf->sound_samples = 0; swf->video_samples = 0; swf->swf_frame_number = 0; @@ -333,9 +265,18 @@ static int swf_write_header(AVFormatContext *s) audio_enc = NULL; for(i=0;inb_streams;i++) { enc = s->streams[i]->codec; - if (enc->codec_type == CODEC_TYPE_AUDIO) - audio_enc = enc; - else { + if (enc->codec_type == CODEC_TYPE_AUDIO) { + if (enc->codec_id == CODEC_ID_MP3) { + if (!enc->frame_size) { + av_log(s, AV_LOG_ERROR, "audio frame size not set\n"); + return -1; + } + audio_enc = enc; + } else { + av_log(enc, AV_LOG_ERROR, "SWF only supports MP3\n"); + return -1; + } + } else { if ( enc->codec_id == CODEC_ID_VP6F || enc->codec_id == CODEC_ID_FLV1 || enc->codec_id == CODEC_ID_MJPEG ) { @@ -476,55 +417,12 @@ static int swf_write_video(AVFormatContext *s, { SWFContext *swf = s->priv_data; ByteIOContext *pb = &s->pb; - int c = 0; - int outSize = 0; - int outSamples = 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 ( swf->audio_type ) { - /* Prescan audio data for this swf frame */ -retry_swf_audio_packet: - if ( ( swf->audio_size-outSize ) >= 4 ) { - int mp3FrameSize = 0; - int mp3SampleRate = 0; - int mp3IsMono = 0; - int mp3SamplesPerFrame = 0; - - /* copy out mp3 header from ring buffer */ - uint8_t header[4]; - for (c=0; c<4; c++) { - header[c] = swf->audio_fifo[(swf->audio_in_pos+outSize+c) % AUDIO_FIFO_SIZE]; - } - - if ( swf_mp3_info(header,&mp3FrameSize,&mp3SamplesPerFrame,&mp3SampleRate,&mp3IsMono) ) { - if ( ( swf->audio_size-outSize ) >= mp3FrameSize ) { - 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_VP6F || swf->video_type == CODEC_ID_FLV1 ) { if ( swf->video_frame_number == 0 ) { @@ -611,20 +509,16 @@ retry_swf_audio_packet: swf->video_samples += swf->samples_per_frame; /* streaming sound always should be placed just before showframe tags */ - if ( outSize > 0 ) { + if (swf->audio_type && swf->audio_in_pos) { put_swf_tag(s, TAG_STREAMBLOCK | TAG_LONG); - put_le16(pb, outSamples); - put_le16(pb, 0); - for (c=0; caudio_fifo[(swf->audio_in_pos+c) % AUDIO_FIFO_SIZE]); - } + put_le16(pb, swf->sound_samples); + put_le16(pb, 0); // seek samples + put_buffer(pb, swf->audio_fifo, swf->audio_in_pos); 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; + swf->sound_samples = 0; + swf->audio_in_pos = 0; } /* output the frame */ @@ -640,22 +534,21 @@ 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; caudio_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 (swf->audio_in_pos + size >= AUDIO_FIFO_SIZE) { + av_log(s, AV_LOG_ERROR, "audio fifo too small to mux audio essence\n"); + return -1; } + memcpy(swf->audio_fifo + swf->audio_in_pos, buf, size); + swf->audio_in_pos += size; + swf->sound_samples += enc->frame_size; + /* if audio only stream make sure we add swf frames */ if ( swf->video_type == 0 ) { swf_write_video(s, enc, 0, 0); @@ -701,9 +594,6 @@ static int swf_write_trailer(AVFormatContext *s) put_le16(pb, video_enc->frame_number); url_fseek(pb, file_size, SEEK_SET); } - - av_free(swf->audio_fifo); - return 0; } #endif //CONFIG_MUXERS -- cgit v1.2.3