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/*
* copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
|
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/** |
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* @file libavcodec/libvorbis.c |
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* Ogg Vorbis codec support via libvorbisenc.
* @author Mark Hills <mark@pogo.org.uk> |
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*/
#include <vorbis/vorbisenc.h>
#include "avcodec.h" |
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#include "bytestream.h" |
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|
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#undef NDEBUG
#include <assert.h>
|
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#define OGGVORBIS_FRAME_SIZE 64 |
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|
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#define BUFFER_SIZE (1024*64) |
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typedef struct OggVorbisContext {
vorbis_info vi ;
vorbis_dsp_state vd ;
vorbis_block vb ; |
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uint8_t buffer[BUFFER_SIZE];
int buffer_index; |
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int eof; |
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/* decoder */
vorbis_comment vc ; |
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ogg_packet op; |
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} OggVorbisContext ;
|
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static av_cold int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) { |
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double cfreq; |
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|
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if(avccontext->flags & CODEC_FLAG_QSCALE) { |
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/* variable bitrate */
if(vorbis_encode_setup_vbr(vi, avccontext->channels, |
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avccontext->sample_rate, |
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avccontext->global_quality / (float)FF_QP2LAMBDA / 10.0)) |
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return -1;
} else {
/* constant bitrate */
if(vorbis_encode_setup_managed(vi, avccontext->channels,
avccontext->sample_rate, -1, avccontext->bit_rate, -1))
return -1;
|
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#ifdef OGGVORBIS_VBR_BY_ESTIMATE |
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/* variable bitrate by estimate */
if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
return -1;
#endif
} |
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|
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/* cutoff frequency */
if(avccontext->cutoff > 0) {
cfreq = avccontext->cutoff / 1000.0;
if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
return -1;
} |
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|
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return vorbis_encode_setup_init(vi); |
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}
|
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static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) { |
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OggVorbisContext *context = avccontext->priv_data ; |
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ogg_packet header, header_comm, header_code;
uint8_t *p; |
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unsigned int offset, len; |
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vorbis_info_init(&context->vi) ;
if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) { |
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av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
return -1 ; |
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}
vorbis_analysis_init(&context->vd, &context->vi) ;
vorbis_block_init(&context->vd, &context->vb) ;
|
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vorbis_comment_init(&context->vc);
vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
vorbis_analysis_headerout(&context->vd, &context->vc, &header,
&header_comm, &header_code); |
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|
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len = header.bytes + header_comm.bytes + header_code.bytes;
avccontext->extradata_size= 64 + len + len/255;
p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
p[0] = 2;
offset = 1;
offset += av_xiphlacing(&p[offset], header.bytes);
offset += av_xiphlacing(&p[offset], header_comm.bytes);
memcpy(&p[offset], header.packet, header.bytes);
offset += header.bytes;
memcpy(&p[offset], header_comm.packet, header_comm.bytes);
offset += header_comm.bytes;
memcpy(&p[offset], header_code.packet, header_code.bytes);
offset += header_code.bytes;
avccontext->extradata_size = offset;
avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size); |
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|
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/* vorbis_block_clear(&context->vb);
vorbis_dsp_clear(&context->vd);
vorbis_info_clear(&context->vi);*/
vorbis_comment_clear(&context->vc); |
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|
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avccontext->frame_size = OGGVORBIS_FRAME_SIZE ; |
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|
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avccontext->coded_frame= avcodec_alloc_frame();
avccontext->coded_frame->key_frame= 1; |
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|
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return 0 ;
}
|
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static int oggvorbis_encode_frame(AVCodecContext *avccontext, |
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unsigned char *packets,
int buf_size, void *data) |
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{
OggVorbisContext *context = avccontext->priv_data ;
ogg_packet op ; |
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signed short *audio = data ; |
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int l;
if(data) {
int samples = OGGVORBIS_FRAME_SIZE;
float **buffer ; |
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|
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buffer = vorbis_analysis_buffer(&context->vd, samples) ;
if(context->vi.channels == 1) {
for(l = 0 ; l < samples ; l++)
buffer[0][l]=audio[l]/32768.f;
} else {
for(l = 0 ; l < samples ; l++){
buffer[0][l]=audio[l*2]/32768.f;
buffer[1][l]=audio[l*2+1]/32768.f;
} |
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} |
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vorbis_analysis_wrote(&context->vd, samples) ; |
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} else {
if(!context->eof)
vorbis_analysis_wrote(&context->vd, 0) ;
context->eof = 1;
} |
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while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) { |
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vorbis_analysis(&context->vb, NULL);
vorbis_bitrate_addblock(&context->vb) ; |
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|
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while(vorbis_bitrate_flushpacket(&context->vd, &op)) { |
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/* i'd love to say the following line is a hack, but sadly it's
* not, apparently the end of stream decision is in libogg. */
if(op.bytes==1) |
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continue; |
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memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
context->buffer_index += sizeof(ogg_packet);
memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
context->buffer_index += op.bytes;
// av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes); |
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} |
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}
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l=0; |
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if(context->buffer_index){ |
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ogg_packet *op2= (ogg_packet*)context->buffer; |
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op2->packet = context->buffer + sizeof(ogg_packet); |
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|
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l= op2->bytes; |
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avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base); |
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//FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate |
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|
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memcpy(packets, op2->packet, l);
context->buffer_index -= l + sizeof(ogg_packet);
memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index); |
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// av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
}
|
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return l; |
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}
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static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) { |
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OggVorbisContext *context = avccontext->priv_data ;
/* ogg_packet op ; */ |
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|
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vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
vorbis_block_clear(&context->vb);
vorbis_dsp_clear(&context->vd);
vorbis_info_clear(&context->vi); |
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av_freep(&avccontext->coded_frame); |
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av_freep(&avccontext->extradata); |
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|
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return 0 ;
}
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AVCodec libvorbis_encoder = {
"libvorbis", |
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CODEC_TYPE_AUDIO,
CODEC_ID_VORBIS,
sizeof(OggVorbisContext),
oggvorbis_encode_init,
oggvorbis_encode_frame, |
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oggvorbis_encode_close,
.capabilities= CODEC_CAP_DELAY, |
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.sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, |
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.long_name= NULL_IF_CONFIG_SMALL("libvorbis Vorbis"), |
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} ; |