2 * copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
4 * This file is part of FFmpeg.
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.
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.
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
23 * Ogg Vorbis codec support via libvorbisenc.
24 * @author Mark Hills <mark@pogo.org.uk>
27 #include <vorbis/vorbisenc.h>
30 #include "bytestream.h"
36 #define OGGVORBIS_FRAME_SIZE 64
38 #define BUFFER_SIZE (1024*64)
40 typedef struct OggVorbisContext {
44 uint8_t buffer[BUFFER_SIZE];
54 static av_cold int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
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))
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;
67 /* constant bitrate */
68 if(vorbis_encode_setup_managed(vi, avccontext->channels,
69 avccontext->sample_rate, minrate, avccontext->bit_rate, maxrate))
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))
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))
85 return vorbis_encode_setup_init(vi);
88 /* How many bytes are needed for a buffer of length 'l' */
89 static int xiph_len(int l) { return (1 + l / 255 + l); }
91 static av_cold int oggvorbis_encode_init(AVCodecContext *avccontext) {
92 OggVorbisContext *context = avccontext->priv_data ;
93 ogg_packet header, header_comm, header_code;
97 vorbis_info_init(&context->vi) ;
98 if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
99 av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed\n") ;
102 vorbis_analysis_init(&context->vd, &context->vi) ;
103 vorbis_block_init(&context->vd, &context->vb) ;
105 vorbis_comment_init(&context->vc);
106 vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
108 vorbis_analysis_headerout(&context->vd, &context->vc, &header,
109 &header_comm, &header_code);
111 avccontext->extradata_size=
112 1 + xiph_len(header.bytes) + xiph_len(header_comm.bytes) +
114 p = avccontext->extradata =
115 av_malloc(avccontext->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
118 offset += av_xiphlacing(&p[offset], header.bytes);
119 offset += av_xiphlacing(&p[offset], header_comm.bytes);
120 memcpy(&p[offset], header.packet, header.bytes);
121 offset += header.bytes;
122 memcpy(&p[offset], header_comm.packet, header_comm.bytes);
123 offset += header_comm.bytes;
124 memcpy(&p[offset], header_code.packet, header_code.bytes);
125 offset += header_code.bytes;
126 assert(offset == avccontext->extradata_size);
128 /* vorbis_block_clear(&context->vb);
129 vorbis_dsp_clear(&context->vd);
130 vorbis_info_clear(&context->vi);*/
131 vorbis_comment_clear(&context->vc);
133 avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
135 avccontext->coded_frame= avcodec_alloc_frame();
136 avccontext->coded_frame->key_frame= 1;
142 static int oggvorbis_encode_frame(AVCodecContext *avccontext,
143 unsigned char *packets,
144 int buf_size, void *data)
146 OggVorbisContext *context = avccontext->priv_data ;
148 signed short *audio = data ;
152 const int samples = avccontext->frame_size;
154 int c, channels = context->vi.channels;
156 buffer = vorbis_analysis_buffer(&context->vd, samples) ;
157 for (c = 0; c < channels; c++) {
158 int co = (channels > 8) ? c :
159 ff_vorbis_encoding_channel_layout_offsets[channels-1][c];
160 for(l = 0 ; l < samples ; l++)
161 buffer[c][l]=audio[l*channels+co]/32768.f;
163 vorbis_analysis_wrote(&context->vd, samples) ;
166 vorbis_analysis_wrote(&context->vd, 0) ;
170 while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
171 vorbis_analysis(&context->vb, NULL);
172 vorbis_bitrate_addblock(&context->vb) ;
174 while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
175 /* i'd love to say the following line is a hack, but sadly it's
176 * not, apparently the end of stream decision is in libogg. */
177 if(op.bytes==1 && op.e_o_s)
179 if (context->buffer_index + sizeof(ogg_packet) + op.bytes > BUFFER_SIZE) {
180 av_log(avccontext, AV_LOG_ERROR, "libvorbis: buffer overflow.");
183 memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
184 context->buffer_index += sizeof(ogg_packet);
185 memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
186 context->buffer_index += op.bytes;
187 // av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
192 if(context->buffer_index){
193 ogg_packet *op2= (ogg_packet*)context->buffer;
194 op2->packet = context->buffer + sizeof(ogg_packet);
197 avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
198 //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
201 av_log(avccontext, AV_LOG_ERROR, "libvorbis: buffer overflow.");
205 memcpy(packets, op2->packet, l);
206 context->buffer_index -= l + sizeof(ogg_packet);
207 memmove(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
208 // av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
215 static av_cold int oggvorbis_encode_close(AVCodecContext *avccontext) {
216 OggVorbisContext *context = avccontext->priv_data ;
217 /* ogg_packet op ; */
219 vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
221 vorbis_block_clear(&context->vb);
222 vorbis_dsp_clear(&context->vd);
223 vorbis_info_clear(&context->vi);
225 av_freep(&avccontext->coded_frame);
226 av_freep(&avccontext->extradata);
232 AVCodec libvorbis_encoder = {
236 sizeof(OggVorbisContext),
237 oggvorbis_encode_init,
238 oggvorbis_encode_frame,
239 oggvorbis_encode_close,
240 .capabilities= CODEC_CAP_DELAY,
241 .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
242 .long_name= NULL_IF_CONFIG_SMALL("libvorbis Vorbis"),