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-rw-r--r--contrib/ffmpeg/libavformat/ogg.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/ogg.c b/contrib/ffmpeg/libavformat/ogg.c
new file mode 100644
index 000000000..369fa4639
--- /dev/null
+++ b/contrib/ffmpeg/libavformat/ogg.c
@@ -0,0 +1,283 @@
+/*
+ * Ogg bitstream support
+ * Mark Hills <mark@pogo.org.uk>
+ *
+ * Uses libogg, but requires libvorbisenc to construct correct headers
+ * when containing Vorbis stream -- currently the only format supported
+ *
+ * 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
+ */
+
+#include <stdio.h>
+
+#include <ogg/ogg.h>
+
+#include "avformat.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+#define DECODER_BUFFER_SIZE 4096
+
+
+typedef struct OggContext {
+ /* output */
+ ogg_stream_state os ;
+ int header_handled ;
+ ogg_packet op;
+
+ /* input */
+ ogg_sync_state oy ;
+} OggContext ;
+
+
+#ifdef CONFIG_MUXERS
+static int ogg_write_header(AVFormatContext *avfcontext)
+{
+ OggContext *context = avfcontext->priv_data;
+ ogg_packet *op= &context->op;
+ int n;
+
+ ogg_stream_init(&context->os, 31415);
+
+ for(n = 0 ; n < avfcontext->nb_streams ; n++) {
+ AVCodecContext *codec = avfcontext->streams[n]->codec;
+ uint8_t *headers = codec->extradata;
+ int headers_len = codec->extradata_size;
+ uint8_t *header_start[3];
+ int header_len[3];
+ int i, j;
+
+ av_set_pts_info(avfcontext->streams[n], 60, 1, AV_TIME_BASE);
+
+ for(j=1,i=0;i<2;++i, ++j) {
+ header_len[i]=0;
+ while(j<headers_len && headers[j]==0xff) {
+ header_len[i]+=0xff;
+ ++j;
+ }
+ header_len[i]+=headers[j];
+ }
+ header_len[2]=headers_len-header_len[0]-header_len[1]-j;
+ headers+=j;
+ header_start[0] = headers;
+ header_start[1] = header_start[0] + header_len[0];
+ header_start[2] = header_start[1] + header_len[1];
+
+ for(i=0; i < 3; ++i){
+ op->bytes = header_len[i];
+
+ op->packet= header_start[i];
+ op->b_o_s= op->packetno==0;
+
+ ogg_stream_packetin(&context->os, op);
+
+ op->packetno++; //FIXME multiple streams
+ }
+
+ context->header_handled = 0 ;
+ }
+
+ return 0 ;
+}
+
+static int ogg_write_packet(AVFormatContext *avfcontext, AVPacket *pkt)
+{
+ OggContext *context = avfcontext->priv_data ;
+ AVCodecContext *avctx= avfcontext->streams[pkt->stream_index]->codec;
+ ogg_packet *op= &context->op;
+ ogg_page og ;
+ int64_t pts;
+
+ pts= av_rescale(pkt->pts, avctx->sample_rate, AV_TIME_BASE);
+
+// av_log(avfcontext, AV_LOG_DEBUG, "M%d\n", size);
+
+ /* flush header packets so audio starts on a new page */
+
+ if(!context->header_handled) {
+ while(ogg_stream_flush(&context->os, &og)) {
+ put_buffer(&avfcontext->pb, og.header, og.header_len) ;
+ put_buffer(&avfcontext->pb, og.body, og.body_len) ;
+ put_flush_packet(&avfcontext->pb);
+ }
+ context->header_handled = 1 ;
+ }
+
+ op->packet = (uint8_t*) pkt->data;
+ op->bytes = pkt->size;
+ op->b_o_s = op->packetno == 0;
+ op->granulepos= pts;
+
+ /* correct the fields in the packet -- essential for streaming */
+
+ ogg_stream_packetin(&context->os, op);
+
+ while(ogg_stream_pageout(&context->os, &og)) {
+ put_buffer(&avfcontext->pb, og.header, og.header_len);
+ put_buffer(&avfcontext->pb, og.body, og.body_len);
+ put_flush_packet(&avfcontext->pb);
+ }
+ op->packetno++;
+
+ return 0;
+}
+
+
+static int ogg_write_trailer(AVFormatContext *avfcontext) {
+ OggContext *context = avfcontext->priv_data ;
+ ogg_page og ;
+
+ while(ogg_stream_flush(&context->os, &og)) {
+ put_buffer(&avfcontext->pb, og.header, og.header_len) ;
+ put_buffer(&avfcontext->pb, og.body, og.body_len) ;
+ put_flush_packet(&avfcontext->pb);
+ }
+
+ ogg_stream_clear(&context->os) ;
+ return 0 ;
+}
+
+
+AVOutputFormat ogg_muxer = {
+ "ogg",
+ "Ogg Vorbis",
+ "audio/x-vorbis",
+ "ogg",
+ sizeof(OggContext),
+ CODEC_ID_VORBIS,
+ 0,
+ ogg_write_header,
+ ogg_write_packet,
+ ogg_write_trailer,
+} ;
+#endif //CONFIG_MUXERS
+
+#if 0
+static int next_packet(AVFormatContext *avfcontext, ogg_packet *op) {
+ OggContext *context = avfcontext->priv_data ;
+ ogg_page og ;
+ char *buf ;
+
+ while(ogg_stream_packetout(&context->os, op) != 1) {
+
+ /* while no pages are available, read in more data to the sync */
+ while(ogg_sync_pageout(&context->oy, &og) != 1) {
+ buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
+ if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
+ return 1 ;
+ ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
+ }
+
+ /* got a page. Feed it into the stream and get the packet */
+ if(ogg_stream_pagein(&context->os, &og) != 0)
+ return 1 ;
+ }
+
+ return 0 ;
+}
+
+
+static int ogg_read_header(AVFormatContext *avfcontext, AVFormatParameters *ap)
+{
+ OggContext *context = avfcontext->priv_data;
+ ogg_packet op ;
+ char *buf ;
+ ogg_page og ;
+ AVStream *ast ;
+ AVCodecContext *codec;
+ uint8_t *p;
+ int i;
+
+ ogg_sync_init(&context->oy) ;
+ buf = ogg_sync_buffer(&context->oy, DECODER_BUFFER_SIZE) ;
+
+ if(get_buffer(&avfcontext->pb, buf, DECODER_BUFFER_SIZE) <= 0)
+ return AVERROR_IO ;
+
+ ogg_sync_wrote(&context->oy, DECODER_BUFFER_SIZE) ;
+ ogg_sync_pageout(&context->oy, &og) ;
+ ogg_stream_init(&context->os, ogg_page_serialno(&og)) ;
+ ogg_stream_pagein(&context->os, &og) ;
+
+ /* currently only one vorbis stream supported */
+
+ ast = av_new_stream(avfcontext, 0) ;
+ if(!ast)
+ return AVERROR_NOMEM ;
+ av_set_pts_info(ast, 60, 1, AV_TIME_BASE);
+
+ codec= &ast->codec;
+ codec->codec_type = CODEC_TYPE_AUDIO;
+ codec->codec_id = CODEC_ID_VORBIS;
+ for(i=0; i<3; i++){
+ if(next_packet(avfcontext, &op)){
+ return -1;
+ }
+ if(op.bytes >= (1<<16) || op.bytes < 0)
+ return -1;
+ codec->extradata_size+= 2 + op.bytes;
+ codec->extradata= av_realloc(codec->extradata, codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ memset(codec->extradata + codec->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+ p= codec->extradata + codec->extradata_size - 2 - op.bytes;
+ *(p++)= op.bytes>>8;
+ *(p++)= op.bytes&0xFF;
+ memcpy(p, op.packet, op.bytes);
+ }
+
+ return 0 ;
+}
+
+
+static int ogg_read_packet(AVFormatContext *avfcontext, AVPacket *pkt) {
+ ogg_packet op ;
+
+ if(next_packet(avfcontext, &op))
+ return AVERROR_IO ;
+ if(av_new_packet(pkt, op.bytes) < 0)
+ return AVERROR_IO ;
+ pkt->stream_index = 0 ;
+ memcpy(pkt->data, op.packet, op.bytes);
+ if(avfcontext->streams[0]->codec.sample_rate && op.granulepos!=-1)
+ pkt->pts= av_rescale(op.granulepos, AV_TIME_BASE, avfcontext->streams[0]->codec.sample_rate);
+// printf("%"PRId64" %d %d\n", pkt->pts, (int)op.granulepos, avfcontext->streams[0]->codec.sample_rate);
+
+ return op.bytes;
+}
+
+
+static int ogg_read_close(AVFormatContext *avfcontext) {
+ OggContext *context = avfcontext->priv_data ;
+
+ ogg_stream_clear(&context->os) ;
+ ogg_sync_clear(&context->oy) ;
+
+ return 0 ;
+}
+
+
+static AVInputFormat ogg_iformat = {
+ "ogg",
+ "Ogg Vorbis",
+ sizeof(OggContext),
+ NULL,
+ ogg_read_header,
+ ogg_read_packet,
+ ogg_read_close,
+ .extensions = "ogg",
+} ;
+#endif
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