summaryrefslogtreecommitdiff
path: root/contrib/ffmpeg/libavcodec/libvorbis.c
diff options
context:
space:
mode:
Diffstat (limited to 'contrib/ffmpeg/libavcodec/libvorbis.c')
-rw-r--r--contrib/ffmpeg/libavcodec/libvorbis.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/libvorbis.c b/contrib/ffmpeg/libavcodec/libvorbis.c
new file mode 100644
index 000000000..3fb507dad
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/libvorbis.c
@@ -0,0 +1,220 @@
+/*
+ * copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file oggvorbis.c
+ * Ogg Vorbis codec support via libvorbisenc.
+ * @author Mark Hills <mark@pogo.org.uk>
+ */
+
+#include <vorbis/vorbisenc.h>
+
+#include "avcodec.h"
+#include "bytestream.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+#define OGGVORBIS_FRAME_SIZE 64
+
+#define BUFFER_SIZE (1024*64)
+
+typedef struct OggVorbisContext {
+ vorbis_info vi ;
+ vorbis_dsp_state vd ;
+ vorbis_block vb ;
+ uint8_t buffer[BUFFER_SIZE];
+ int buffer_index;
+
+ /* decoder */
+ vorbis_comment vc ;
+ ogg_packet op;
+} OggVorbisContext ;
+
+
+static int oggvorbis_init_encoder(vorbis_info *vi, AVCodecContext *avccontext) {
+ double cfreq;
+
+ if(avccontext->flags & CODEC_FLAG_QSCALE) {
+ /* variable bitrate */
+ if(vorbis_encode_setup_vbr(vi, avccontext->channels,
+ avccontext->sample_rate,
+ avccontext->global_quality / (float)FF_QP2LAMBDA))
+ return -1;
+ } else {
+ /* constant bitrate */
+ if(vorbis_encode_setup_managed(vi, avccontext->channels,
+ avccontext->sample_rate, -1, avccontext->bit_rate, -1))
+ return -1;
+
+#ifdef OGGVORBIS_VBR_BY_ESTIMATE
+ /* variable bitrate by estimate */
+ if(vorbis_encode_ctl(vi, OV_ECTL_RATEMANAGE_AVG, NULL))
+ return -1;
+#endif
+ }
+
+ /* cutoff frequency */
+ if(avccontext->cutoff > 0) {
+ cfreq = avccontext->cutoff / 1000.0;
+ if(vorbis_encode_ctl(vi, OV_ECTL_LOWPASS_SET, &cfreq))
+ return -1;
+ }
+
+ return vorbis_encode_setup_init(vi);
+}
+
+static int oggvorbis_encode_init(AVCodecContext *avccontext) {
+ OggVorbisContext *context = avccontext->priv_data ;
+ ogg_packet header, header_comm, header_code;
+ uint8_t *p;
+ unsigned int offset, len;
+
+ vorbis_info_init(&context->vi) ;
+ if(oggvorbis_init_encoder(&context->vi, avccontext) < 0) {
+ av_log(avccontext, AV_LOG_ERROR, "oggvorbis_encode_init: init_encoder failed") ;
+ return -1 ;
+ }
+ vorbis_analysis_init(&context->vd, &context->vi) ;
+ vorbis_block_init(&context->vd, &context->vb) ;
+
+ vorbis_comment_init(&context->vc);
+ vorbis_comment_add_tag(&context->vc, "encoder", LIBAVCODEC_IDENT) ;
+
+ vorbis_analysis_headerout(&context->vd, &context->vc, &header,
+ &header_comm, &header_code);
+
+ len = header.bytes + header_comm.bytes + header_code.bytes;
+ avccontext->extradata_size= 64 + len + len/255;
+ p = avccontext->extradata= av_mallocz(avccontext->extradata_size);
+ p[0] = 2;
+ offset = 1;
+ offset += av_xiphlacing(&p[offset], header.bytes);
+ offset += av_xiphlacing(&p[offset], header_comm.bytes);
+ memcpy(&p[offset], header.packet, header.bytes);
+ offset += header.bytes;
+ memcpy(&p[offset], header_comm.packet, header_comm.bytes);
+ offset += header_comm.bytes;
+ memcpy(&p[offset], header_code.packet, header_code.bytes);
+ offset += header_code.bytes;
+ avccontext->extradata_size = offset;
+ avccontext->extradata= av_realloc(avccontext->extradata, avccontext->extradata_size);
+
+/* vorbis_block_clear(&context->vb);
+ vorbis_dsp_clear(&context->vd);
+ vorbis_info_clear(&context->vi);*/
+ vorbis_comment_clear(&context->vc);
+
+ avccontext->frame_size = OGGVORBIS_FRAME_SIZE ;
+
+ avccontext->coded_frame= avcodec_alloc_frame();
+ avccontext->coded_frame->key_frame= 1;
+
+ return 0 ;
+}
+
+
+static int oggvorbis_encode_frame(AVCodecContext *avccontext,
+ unsigned char *packets,
+ int buf_size, void *data)
+{
+ OggVorbisContext *context = avccontext->priv_data ;
+ float **buffer ;
+ ogg_packet op ;
+ signed short *audio = data ;
+ int l, samples = data ? OGGVORBIS_FRAME_SIZE : 0;
+
+ buffer = vorbis_analysis_buffer(&context->vd, samples) ;
+
+ if(context->vi.channels == 1) {
+ for(l = 0 ; l < samples ; l++)
+ buffer[0][l]=audio[l]/32768.f;
+ } else {
+ for(l = 0 ; l < samples ; l++){
+ buffer[0][l]=audio[l*2]/32768.f;
+ buffer[1][l]=audio[l*2+1]/32768.f;
+ }
+ }
+
+ vorbis_analysis_wrote(&context->vd, samples) ;
+
+ while(vorbis_analysis_blockout(&context->vd, &context->vb) == 1) {
+ vorbis_analysis(&context->vb, NULL);
+ vorbis_bitrate_addblock(&context->vb) ;
+
+ while(vorbis_bitrate_flushpacket(&context->vd, &op)) {
+ /* i'd love to say the following line is a hack, but sadly it's
+ * not, apparently the end of stream decision is in libogg. */
+ if(op.bytes==1)
+ continue;
+ memcpy(context->buffer + context->buffer_index, &op, sizeof(ogg_packet));
+ context->buffer_index += sizeof(ogg_packet);
+ memcpy(context->buffer + context->buffer_index, op.packet, op.bytes);
+ context->buffer_index += op.bytes;
+// av_log(avccontext, AV_LOG_DEBUG, "e%d / %d\n", context->buffer_index, op.bytes);
+ }
+ }
+
+ l=0;
+ if(context->buffer_index){
+ ogg_packet *op2= (ogg_packet*)context->buffer;
+ op2->packet = context->buffer + sizeof(ogg_packet);
+
+ l= op2->bytes;
+ avccontext->coded_frame->pts= av_rescale_q(op2->granulepos, (AVRational){1, avccontext->sample_rate}, avccontext->time_base);
+ //FIXME we should reorder the user supplied pts and not assume that they are spaced by 1/sample_rate
+
+ memcpy(packets, op2->packet, l);
+ context->buffer_index -= l + sizeof(ogg_packet);
+ memcpy(context->buffer, context->buffer + l + sizeof(ogg_packet), context->buffer_index);
+// av_log(avccontext, AV_LOG_DEBUG, "E%d\n", l);
+ }
+
+ return l;
+}
+
+
+static int oggvorbis_encode_close(AVCodecContext *avccontext) {
+ OggVorbisContext *context = avccontext->priv_data ;
+/* ogg_packet op ; */
+
+ vorbis_analysis_wrote(&context->vd, 0) ; /* notify vorbisenc this is EOF */
+
+ vorbis_block_clear(&context->vb);
+ vorbis_dsp_clear(&context->vd);
+ vorbis_info_clear(&context->vi);
+
+ av_freep(&avccontext->coded_frame);
+ av_freep(&avccontext->extradata);
+
+ return 0 ;
+}
+
+
+AVCodec libvorbis_encoder = {
+ "libvorbis",
+ CODEC_TYPE_AUDIO,
+ CODEC_ID_VORBIS,
+ sizeof(OggVorbisContext),
+ oggvorbis_encode_init,
+ oggvorbis_encode_frame,
+ oggvorbis_encode_close,
+ .capabilities= CODEC_CAP_DELAY,
+} ;
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-27 08:44:13 +0000