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 libavcodec/libvorbis.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     int eof;
  46
  47     /* decoder */
  48     vorbis_comment vc ;
  49     ogg_packet op;
  50 } OggVorbisContext ;
  51
  52
  53 static av_cold int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
  54     double cfreq;
  55
  56     if(avccontext->flags & CODEC_FLAG_QSCALE) {
  57         /* variable bitrate */
  58         if(vorbis_encode_setup_vbr(vi, avccontext->channels,
  59                 avccontext->sample_rate,
  60                 avccontext->global_quality / (float)FF_QP2LAMBDA / 10.0))
  61             return -1;
  62     } else {
  63         /* constant bitrate */
  64         if(vorbis_encode_setup_managed(vi, avccontext->channels,
  65                 avccontext->sample_rate, -1, avccontext->bit_rate, -1))
  66             return -1;
  67
  68 #ifdef OGGVORBIS_VBR_BY_ESTIMATE
  69         /* variable bitrate by estimate */
  70         if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
  71             return -1;
  72 #endif
  73     }
  74
  75     /* cutoff frequency */
  76     if(avccontext->cutoff > 0) {
  77         cfreq = avccontext->cutoff / 1000.0;
  78         if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
  79             return -1;
  80     }
  81
  82     return vorbis_encode_setup_init(vi);
  83 }
  84
  85 static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) {
  86     OggVorbisContext *context = avccontext->priv_data ;
  87     ogg_packet header, header_comm, header_code;
  88     uint8_t *p;
  89     unsigned int offset, len;
  90
  91     vorbis_info_init(&context->vi) ;
  92     if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
  93         av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
  94         return -1 ;
  95     }
  96     vorbis_analysis_init(&context->vd, &context->vi) ;
  97     vorbis_block_init(&context->vd, &context->vb) ;
  98
  99     vorbis_comment_init(&context->vc);
 100     vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
 101
 102     vorbis_analysis_headerout(&context->vd, &context->vc, &header,
 103                                 &header_comm, &header_code);
 104
 105     len = header.bytes + header_comm.bytes +  header_code.bytes;
 106     avccontext->extradata_size= 64 + len + len/255;
 107     p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
 108     p[0] = 2;
 109     offset = 1;
 110     offset += av_xiphlacing(&p[offset], header.bytes);
 111     offset += av_xiphlacing(&p[offset], header_comm.bytes);
 112     memcpy(&p[offset], header.packet, header.bytes);
 113     offset += header.bytes;
 114     memcpy(&p[offset], header_comm.packet, header_comm.bytes);
 115     offset += header_comm.bytes;
 116     memcpy(&p[offset], header_code.packet, header_code.bytes);
 117     offset += header_code.bytes;
 118     avccontext->extradata_size = offset;
 119     avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
 120
 121 /*    vorbis_block_clear(&context->vb);
 122     vorbis_dsp_clear(&context->vd);
 123     vorbis_info_clear(&context->vi);*/
 124     vorbis_comment_clear(&context->vc);
 125
 126     avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
 127
 128     avccontext->coded_frame= avcodec_alloc_frame();
 129     avccontext->coded_frame->key_frame= 1;
 130
 131     return 0 ;
 132 }
 133
 134
 135 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
 136                                   unsigned char *packets,
 137                            int buf_size, void *data)
 138 {
 139     OggVorbisContext *context = avccontext->priv_data ;
 140     ogg_packet op ;
 141     signed short *audio = data ;
 142     int l;
 143
 144     if(data) {
 145         int samples = OGGVORBIS_FRAME_SIZE;
 146         float **buffer ;
 147
 148         buffer = vorbis_analysis_buffer(&context->vd, samples) ;
 149         if(context->vi.channels == 1) {
 150             for(l = 0 ; l < samples ; l++)
 151                 buffer[0][l]=audio[l]/32768.f;
 152         } else {
 153             for(l = 0 ; l < samples ; l++){
 154                 buffer[0][l]=audio[l*2]/32768.f;
 155                 buffer[1][l]=audio[l*2+1]/32768.f;
 156             }
 157         }
 158         vorbis_analysis_wrote(&context->vd, samples) ;
 159     } else {
 160         if(!context->eof)
 161             vorbis_analysis_wrote(&context->vd, 0) ;
 162         context->eof = 1;
 163     }
 164
 165     while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
 166         vorbis_analysis(&context->vb, NULL);
 167         vorbis_bitrate_addblock(&context->vb) ;
 168
 169         while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
 170             /* i'd love to say the following line is a hack, but sadly it's
 171              * not, apparently the end of stream decision is in libogg. */
 172             if(op.bytes==1)
 173                 continue;
 174             memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
 175             context->buffer_index += sizeof(ogg_packet);
 176             memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
 177             context->buffer_index += op.bytes;
 178 //            av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
 179         }
 180     }
 181
 182     l=0;
 183     if(context->buffer_index){
 184         ogg_packet *op2= (ogg_packet*)context->buffer;
 185         op2->packet = context->buffer + sizeof(ogg_packet);
 186
 187         l=  op2->bytes;
 188         avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
 189         //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
 190
 191         memcpy(packets, op2->packet, l);
 192         context->buffer_index -= l + sizeof(ogg_packet);
 193         memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
 194 //        av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
 195     }
 196
 197     return l;
 198 }
 199
 200
 201 static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) {
 202     OggVorbisContext *context = avccontext->priv_data ;
 203 /*  ogg_packet op ; */
 204
 205     vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
 206
 207     vorbis_block_clear(&context->vb);
 208     vorbis_dsp_clear(&context->vd);
 209     vorbis_info_clear(&context->vi);
 210
 211     av_freep(&avccontext->coded_frame);
 212     av_freep(&avccontext->extradata);
 213
 214     return 0 ;
 215 }
 216
 217
 218 AVCodec libvorbis_encoder = {
 219     "libvorbis",
 220     CODEC_TYPE_AUDIO,
 221     CODEC_ID_VORBIS,
 222     sizeof(OggVorbisContext),
 223     oggvorbis_encode_init,
 224     oggvorbis_encode_frame,
 225     oggvorbis_encode_close,
 226     .capabilities= CODEC_CAP_DELAY,
 227     .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
 228     .long_name= NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
 229 } ;