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00027 #include <vorbis/vorbisenc.h>
00028
00029 #include "libavutil/opt.h"
00030 #include "avcodec.h"
00031 #include "bytestream.h"
00032 #include "internal.h"
00033 #include "vorbis.h"
00034 #include "libavutil/mathematics.h"
00035
00036 #undef NDEBUG
00037 #include <assert.h>
00038
00039 #define OGGVORBIS_FRAME_SIZE 64
00040
00041 #define BUFFER_SIZE (1024 * 64)
00042
00043 typedef struct OggVorbisContext {
00044 AVClass *av_class;
00045 vorbis_info vi;
00046 vorbis_dsp_state vd;
00047 vorbis_block vb;
00048 uint8_t buffer[BUFFER_SIZE];
00049 int buffer_index;
00050 int eof;
00051
00052
00053 vorbis_comment vc;
00054 ogg_packet op;
00055
00056 double iblock;
00057 } OggVorbisContext;
00058
00059 static const AVOption options[] = {
00060 { "iblock", "Sets the impulse block bias", offsetof(OggVorbisContext, iblock), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, -15, 0, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM },
00061 { NULL }
00062 };
00063
00064 static const AVCodecDefault defaults[] = {
00065 { "b", "0" },
00066 { NULL },
00067 };
00068
00069 static const AVClass class = { "libvorbis", av_default_item_name, options, LIBAVUTIL_VERSION_INT };
00070
00071 static av_cold int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext)
00072 {
00073 OggVorbisContext *context = avccontext->priv_data;
00074 double cfreq;
00075
00076 if (avccontext->flags & CODEC_FLAG_QSCALE || !avccontext->bit_rate) {
00077
00078
00079
00080
00081 float q = avccontext->global_quality / (float)FF_QP2LAMBDA;
00082
00083 if (!(avccontext->flags & CODEC_FLAG_QSCALE))
00084 q = 3.0;
00085 if (vorbis_encode_setup_vbr(vi, avccontext->channels,
00086 avccontext->sample_rate,
00087 q / 10.0))
00088 return -1;
00089 } else {
00090 int minrate = avccontext->rc_min_rate > 0 ? avccontext->rc_min_rate : -1;
00091 int maxrate = avccontext->rc_max_rate > 0 ? avccontext->rc_max_rate : -1;
00092
00093
00094 if (vorbis_encode_setup_managed(vi, avccontext->channels,
00095 avccontext->sample_rate, maxrate,
00096 avccontext->bit_rate, minrate))
00097 return -1;
00098
00099
00100 if (minrate == -1 && maxrate == -1)
00101 if (vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE2_SET, NULL))
00102 return -1;
00103 }
00104
00105
00106 if (avccontext->cutoff > 0) {
00107 cfreq = avccontext->cutoff / 1000.0;
00108 if (vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
00109 return -1;
00110 }
00111
00112 if (context->iblock) {
00113 vorbis_encode_ctl(vi, OV_ECTL_IBLOCK_SET, &context->iblock);
00114 }
00115
00116 return vorbis_encode_setup_init(vi);
00117 }
00118
00119
00120 static int xiph_len(int l)
00121 {
00122 return 1 + l / 255 + l;
00123 }
00124
00125 static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext)
00126 {
00127 OggVorbisContext *context = avccontext->priv_data;
00128 ogg_packet header, header_comm, header_code;
00129 uint8_t *p;
00130 unsigned int offset;
00131
00132 vorbis_info_init(&context->vi);
00133 if (oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
00134 av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed\n");
00135 return -1;
00136 }
00137 vorbis_analysis_init(&context->vd, &context->vi);
00138 vorbis_block_init(&context->vd, &context->vb);
00139
00140 vorbis_comment_init(&context->vc);
00141 vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT);
00142
00143 vorbis_analysis_headerout(&context->vd, &context->vc, &header,
00144 &header_comm, &header_code);
00145
00146 avccontext->extradata_size =
00147 1 + xiph_len(header.bytes) + xiph_len(header_comm.bytes) +
00148 header_code.bytes;
00149 p = avccontext->extradata =
00150 av_malloc(avccontext->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00151 p[0] = 2;
00152 offset = 1;
00153 offset += av_xiphlacing(&p[offset], header.bytes);
00154 offset += av_xiphlacing(&p[offset], header_comm.bytes);
00155 memcpy(&p[offset], header.packet, header.bytes);
00156 offset += header.bytes;
00157 memcpy(&p[offset], header_comm.packet, header_comm.bytes);
00158 offset += header_comm.bytes;
00159 memcpy(&p[offset], header_code.packet, header_code.bytes);
00160 offset += header_code.bytes;
00161 assert(offset == avccontext->extradata_size);
00162
00163 #if 0
00164 vorbis_block_clear(&context->vb);
00165 vorbis_dsp_clear(&context->vd);
00166 vorbis_info_clear(&context->vi);
00167 #endif
00168 vorbis_comment_clear(&context->vc);
00169
00170 avccontext->frame_size = OGGVORBIS_FRAME_SIZE;
00171
00172 avccontext->coded_frame = avcodec_alloc_frame();
00173 avccontext->coded_frame->key_frame = 1;
00174
00175 return 0;
00176 }
00177
00178 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
00179 unsigned char *packets,
00180 int buf_size, void *data)
00181 {
00182 OggVorbisContext *context = avccontext->priv_data;
00183 ogg_packet op;
00184 signed short *audio = data;
00185 int l;
00186
00187 if (data) {
00188 const int samples = avccontext->frame_size;
00189 float **buffer;
00190 int c, channels = context->vi.channels;
00191
00192 buffer = vorbis_analysis_buffer(&context->vd, samples);
00193 for (c = 0; c < channels; c++) {
00194 int co = (channels > 8) ? c :
00195 ff_vorbis_encoding_channel_layout_offsets[channels - 1][c];
00196 for (l = 0; l < samples; l++)
00197 buffer[c][l] = audio[l * channels + co] / 32768.f;
00198 }
00199 vorbis_analysis_wrote(&context->vd, samples);
00200 } else {
00201 if (!context->eof)
00202 vorbis_analysis_wrote(&context->vd, 0);
00203 context->eof = 1;
00204 }
00205
00206 while (vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
00207 vorbis_analysis(&context->vb, NULL);
00208 vorbis_bitrate_addblock(&context->vb);
00209
00210 while (vorbis_bitrate_flushpacket(&context->vd, &op)) {
00211
00212
00213 if (op.bytes == 1 && op.e_o_s)
00214 continue;
00215 if (context->buffer_index + sizeof(ogg_packet) + op.bytes > BUFFER_SIZE) {
00216 av_log(avccontext, AV_LOG_ERROR, "libvorbis: buffer overflow.");
00217 return -1;
00218 }
00219 memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
00220 context->buffer_index += sizeof(ogg_packet);
00221 memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
00222 context->buffer_index += op.bytes;
00223
00224 }
00225 }
00226
00227 l = 0;
00228 if (context->buffer_index) {
00229 ogg_packet *op2 = (ogg_packet *)context->buffer;
00230 op2->packet = context->buffer + sizeof(ogg_packet);
00231
00232 l = op2->bytes;
00233 avccontext->coded_frame->pts = av_rescale_q(op2->granulepos, (AVRational) { 1, avccontext->sample_rate }, avccontext->time_base);
00234
00235
00236 if (l > buf_size) {
00237 av_log(avccontext, AV_LOG_ERROR, "libvorbis: buffer overflow.");
00238 return -1;
00239 }
00240
00241 memcpy(packets, op2->packet, l);
00242 context->buffer_index -= l + sizeof(ogg_packet);
00243 memmove(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
00244
00245 }
00246
00247 return l;
00248 }
00249
00250 static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext)
00251 {
00252 OggVorbisContext *context = avccontext->priv_data;
00253
00254
00255 vorbis_analysis_wrote(&context->vd, 0);
00256
00257 vorbis_block_clear(&context->vb);
00258 vorbis_dsp_clear(&context->vd);
00259 vorbis_info_clear(&context->vi);
00260
00261 av_freep(&avccontext->coded_frame);
00262 av_freep(&avccontext->extradata);
00263
00264 return 0;
00265 }
00266
00267 AVCodec ff_libvorbis_encoder = {
00268 .name = "libvorbis",
00269 .type = AVMEDIA_TYPE_AUDIO,
00270 .id = CODEC_ID_VORBIS,
00271 .priv_data_size = sizeof(OggVorbisContext),
00272 .init = oggvorbis_encode_init,
00273 .encode = oggvorbis_encode_frame,
00274 .close = oggvorbis_encode_close,
00275 .capabilities = CODEC_CAP_DELAY,
00276 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
00277 .long_name = NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),
00278 .priv_class = &class,
00279 .defaults = defaults,
00280 };