libavcodec/libvorbis.c

   1 /*
   2  * copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file oggvorbis.c
  23  * Ogg Vorbis codec support via libvorbisenc.
  24  * @author Mark Hills <mark@pogo.org.uk>
  25  */
  26
  27 #include <vorbis/vorbisenc.h>
  28
  29 #include "avcodec.h"
  30 #include "bytestream.h"
  31
  32 #undef NDEBUG
  33 #include <assert.h>
  34
  35 #define OGGVORBIS_FRAME_SIZE 64
  36
  37 #define BUFFER_SIZE (1024*64)
  38
  39 typedef struct OggVorbisContext {
  40     vorbis_info vi ;
  41     vorbis_dsp_state vd ;
  42     vorbis_block vb ;
  43     uint8_t buffer[BUFFER_SIZE];
  44     int buffer_index;
  45
  46     /* decoder */
  47     vorbis_comment vc ;
  48     ogg_packet op;
  49 } OggVorbisContext ;
  50
  51
  52 static int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
  53     double cfreq;
  54
  55     if(avccontext->flags & CODEC_FLAG_QSCALE) {
  56         /* variable bitrate */
  57         if(vorbis_encode_setup_vbr(vi, avccontext->channels,
  58                 avccontext->sample_rate,
  59                 avccontext->global_quality / (float)FF_QP2LAMBDA))
  60             return -1;
  61     } else {
  62         /* constant bitrate */
  63         if(vorbis_encode_setup_managed(vi, avccontext->channels,
  64                 avccontext->sample_rate, -1, avccontext->bit_rate, -1))
  65             return -1;
  66
  67 #ifdef OGGVORBIS_VBR_BY_ESTIMATE
  68         /* variable bitrate by estimate */
  69         if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
  70             return -1;
  71 #endif
  72     }
  73
  74     /* cutoff frequency */
  75     if(avccontext->cutoff > 0) {
  76         cfreq = avccontext->cutoff / 1000.0;
  77         if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
  78             return -1;
  79     }
  80
  81     return vorbis_encode_setup_init(vi);
  82 }
  83
  84 static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) {
  85     OggVorbisContext *context = avccontext->priv_data ;
  86     ogg_packet header, header_comm, header_code;
  87     uint8_t *p;
  88     unsigned int offset, len;
  89
  90     vorbis_info_init(&context->vi) ;
  91     if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
  92         av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
  93         return -1 ;
  94     }
  95     vorbis_analysis_init(&context->vd, &context->vi) ;
  96     vorbis_block_init(&context->vd, &context->vb) ;
  97
  98     vorbis_comment_init(&context->vc);
  99     vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
 100
 101     vorbis_analysis_headerout(&context->vd, &context->vc, &header,
 102                                 &header_comm, &header_code);
 103
 104     len = header.bytes + header_comm.bytes +  header_code.bytes;
 105     avccontext->extradata_size= 64 + len + len/255;
 106     p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
 107     p[0] = 2;
 108     offset = 1;
 109     offset += av_xiphlacing(&p[offset], header.bytes);
 110     offset += av_xiphlacing(&p[offset], header_comm.bytes);
 111     memcpy(&p[offset], header.packet, header.bytes);
 112     offset += header.bytes;
 113     memcpy(&p[offset], header_comm.packet, header_comm.bytes);
 114     offset += header_comm.bytes;
 115     memcpy(&p[offset], header_code.packet, header_code.bytes);
 116     offset += header_code.bytes;
 117     avccontext->extradata_size = offset;
 118     avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
 119
 120 /*    vorbis_block_clear(&context->vb);
 121     vorbis_dsp_clear(&context->vd);
 122     vorbis_info_clear(&context->vi);*/
 123     vorbis_comment_clear(&context->vc);
 124
 125     avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
 126
 127     avccontext->coded_frame= avcodec_alloc_frame();
 128     avccontext->coded_frame->key_frame= 1;
 129
 130     return 0 ;
 131 }
 132
 133
 134 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
 135                                   unsigned char *packets,
 136                            int buf_size, void *data)
 137 {
 138     OggVorbisContext *context = avccontext->priv_data ;
 139     float **buffer ;
 140     ogg_packet op ;
 141     signed short *audio = data ;
 142     int l, samples = data ? OGGVORBIS_FRAME_SIZE : 0;
 143
 144     buffer = vorbis_analysis_buffer(&context->vd, samples) ;
 145
 146     if(context->vi.channels == 1) {
 147         for(l = 0 ; l < samples ; l++)
 148             buffer[0][l]=audio[l]/32768.f;
 149     } else {
 150         for(l = 0 ; l < samples ; l++){
 151             buffer[0][l]=audio[l*2]/32768.f;
 152             buffer[1][l]=audio[l*2+1]/32768.f;
 153         }
 154     }
 155
 156     vorbis_analysis_wrote(&context->vd, samples) ;
 157
 158     while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
 159         vorbis_analysis(&context->vb, NULL);
 160         vorbis_bitrate_addblock(&context->vb) ;
 161
 162         while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
 163             /* i'd love to say the following line is a hack, but sadly it's
 164              * not, apparently the end of stream decision is in libogg. */
 165             if(op.bytes==1)
 166                 continue;
 167             memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
 168             context->buffer_index += sizeof(ogg_packet);
 169             memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
 170             context->buffer_index += op.bytes;
 171 //            av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
 172         }
 173     }
 174
 175     l=0;
 176     if(context->buffer_index){
 177         ogg_packet *op2= (ogg_packet*)context->buffer;
 178         op2->packet = context->buffer + sizeof(ogg_packet);
 179
 180         l=  op2->bytes;
 181         avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
 182         //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
 183
 184         memcpy(packets, op2->packet, l);
 185         context->buffer_index -= l + sizeof(ogg_packet);
 186         memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
 187 //        av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
 188     }
 189
 190     return l;
 191 }
 192
 193
 194 static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) {
 195     OggVorbisContext *context = avccontext->priv_data ;
 196 /*  ogg_packet op ; */
 197
 198     vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
 199
 200     vorbis_block_clear(&context->vb);
 201     vorbis_dsp_clear(&context->vd);
 202     vorbis_info_clear(&context->vi);
 203
 204     av_freep(&avccontext->coded_frame);
 205     av_freep(&avccontext->extradata);
 206
 207     return 0 ;
 208 }
 209
 210
 211 AVCodec libvorbis_encoder = {
 212     "libvorbis",
 213     CODEC_TYPE_AUDIO,
 214     CODEC_ID_VORBIS,
 215     sizeof(OggVorbisContext),
 216     oggvorbis_encode_init,
 217     oggvorbis_encode_frame,
 218     oggvorbis_encode_close,
 219     .capabilities= CODEC_CAP_DELAY,
 220     .long_name= "libvorbis Vorbis",
 221 } ;