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
  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 #include "vorbis.h"
  32
  33 #undef NDEBUG
  34 #include <assert.h>
  35
  36 #define OGGVORBIS_FRAME_SIZE 64
  37
  38 #define BUFFER_SIZE (1024*64)
  39
  40 typedef struct OggVorbisContext {
  41     vorbis_info vi ;
  42     vorbis_dsp_state vd ;
  43     vorbis_block vb ;
  44     uint8_t buffer[BUFFER_SIZE];
  45     int buffer_index;
  46     int eof;
  47
  48     /* decoder */
  49     vorbis_comment vc ;
  50     ogg_packet op;
  51 } OggVorbisContext ;
  52
  53
  54 static av_cold int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
  55     double cfreq;
  56
  57     if(avccontext->flags & CODEC_FLAG_QSCALE) {
  58         /* variable bitrate */
  59         if(vorbis_encode_setup_vbr(vi, avccontext->channels,
  60                 avccontext->sample_rate,
  61                 avccontext->global_quality / (float)FF_QP2LAMBDA / 10.0))
  62             return -1;
  63     } else {
  64         int minrate = avccontext->rc_min_rate > 0 ? avccontext->rc_min_rate : -1;
  65         int maxrate = avccontext->rc_min_rate > 0 ? avccontext->rc_max_rate : -1;
  66
  67         /* constant bitrate */
  68         if(vorbis_encode_setup_managed(vi, avccontext->channels,
  69                 avccontext->sample_rate, minrate, avccontext->bit_rate, maxrate))
  70             return -1;
  71
  72         /* variable bitrate by estimate, disable slow rate management */
  73         if(minrate == -1 && maxrate == -1)
  74             if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL))
  75                 return -1;
  76     }
  77
  78     /* cutoff frequency */
  79     if(avccontext->cutoff > 0) {
  80         cfreq = avccontext->cutoff / 1000.0;
  81         if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
  82             return -1;
  83     }
  84
  85     return vorbis_encode_setup_init(vi);
  86 }
  87
  88 static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) {
  89     OggVorbisContext *context = avccontext->priv_data ;
  90     ogg_packet header, header_comm, header_code;
  91     uint8_t *p;
  92     unsigned int offset, len;
  93
  94     vorbis_info_init(&context->vi) ;
  95     if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
  96         av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed\n") ;
  97         return -1 ;
  98     }
  99     vorbis_analysis_init(&context->vd, &context->vi) ;
 100     vorbis_block_init(&context->vd, &context->vb) ;
 101
 102     vorbis_comment_init(&context->vc);
 103     vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
 104
 105     vorbis_analysis_headerout(&context->vd, &context->vc, &header,
 106                                 &header_comm, &header_code);
 107
 108     len = header.bytes + header_comm.bytes +  header_code.bytes;
 109     avccontext->extradata_size= 64 + len + len/255;
 110     p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
 111     p[0] = 2;
 112     offset = 1;
 113     offset += av_xiphlacing(&p[offset], header.bytes);
 114     offset += av_xiphlacing(&p[offset], header_comm.bytes);
 115     memcpy(&p[offset], header.packet, header.bytes);
 116     offset += header.bytes;
 117     memcpy(&p[offset], header_comm.packet, header_comm.bytes);
 118     offset += header_comm.bytes;
 119     memcpy(&p[offset], header_code.packet, header_code.bytes);
 120     offset += header_code.bytes;
 121     avccontext->extradata_size = offset;
 122     avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
 123
 124 /*    vorbis_block_clear(&context->vb);
 125     vorbis_dsp_clear(&context->vd);
 126     vorbis_info_clear(&context->vi);*/
 127     vorbis_comment_clear(&context->vc);
 128
 129     avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
 130
 131     avccontext->coded_frame= avcodec_alloc_frame();
 132     avccontext->coded_frame->key_frame= 1;
 133
 134     return 0 ;
 135 }
 136
 137
 138 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
 139                                   unsigned char *packets,
 140                            int buf_size, void *data)
 141 {
 142     OggVorbisContext *context = avccontext->priv_data ;
 143     ogg_packet op ;
 144     signed short *audio = data ;
 145     int l;
 146
 147     if(data) {
 148         int samples = OGGVORBIS_FRAME_SIZE;
 149         float **buffer ;
 150         int c, channels = context->vi.channels;
 151
 152         buffer = vorbis_analysis_buffer(&context->vd, samples) ;
 153         for (c = 0; c < channels; c++) {
 154             int co = (channels > 8) ? c :
 155                 ff_vorbis_encoding_channel_layout_offsets[channels-1][c];
 156             for(l = 0 ; l < samples ; l++)
 157                 buffer[c][l]=audio[l*channels+co]/32768.f;
 158         }
 159         vorbis_analysis_wrote(&context->vd, samples) ;
 160     } else {
 161         if(!context->eof)
 162             vorbis_analysis_wrote(&context->vd, 0) ;
 163         context->eof = 1;
 164     }
 165
 166     while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
 167         vorbis_analysis(&context->vb, NULL);
 168         vorbis_bitrate_addblock(&context->vb) ;
 169
 170         while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
 171             /* i'd love to say the following line is a hack, but sadly it's
 172              * not, apparently the end of stream decision is in libogg. */
 173             if(op.bytes==1 && op.e_o_s)
 174                 continue;
 175             memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
 176             context->buffer_index += sizeof(ogg_packet);
 177             memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
 178             context->buffer_index += op.bytes;
 179 //            av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
 180         }
 181     }
 182
 183     l=0;
 184     if(context->buffer_index){
 185         ogg_packet *op2= (ogg_packet*)context->buffer;
 186         op2->packet = context->buffer + sizeof(ogg_packet);
 187
 188         l=  op2->bytes;
 189         avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
 190         //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
 191
 192         memcpy(packets, op2->packet, l);
 193         context->buffer_index -= l + sizeof(ogg_packet);
 194         memmove(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
 195 //        av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
 196     }
 197
 198     return l;
 199 }
 200
 201
 202 static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) {
 203     OggVorbisContext *context = avccontext->priv_data ;
 204 /*  ogg_packet op ; */
 205
 206     vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
 207
 208     vorbis_block_clear(&context->vb);
 209     vorbis_dsp_clear(&context->vd);
 210     vorbis_info_clear(&context->vi);
 211
 212     av_freep(&avccontext->coded_frame);
 213     av_freep(&avccontext->extradata);
 214
 215     return 0 ;
 216 }
 217
 218
 219 AVCodec libvorbis_encoder = {
 220     "libvorbis",
 221     AVMEDIA_TYPE_AUDIO,
 222     CODEC_ID_VORBIS,
 223     sizeof(OggVorbisContext),
 224     oggvorbis_encode_init,
 225     oggvorbis_encode_frame,
 226     oggvorbis_encode_close,
 227     .capabilities= CODEC_CAP_DELAY,
 228     .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
 229     .long_name= NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
 230 } ;