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authorBaptiste Coudurier <baptiste.coudurier@gmail.com>2007-11-10 18:27:03 +0000
committerBaptiste Coudurier <baptiste.coudurier@gmail.com>2007-11-10 18:27:03 +0000
commit5118cae69411185188733d68b5f0d75dbee1f92e (patch)
treef2e1bfacc8aebde903c1d59ea162ab322eef44c1 /libavformat/oggenc.c
parent96e2fbf27b36598aef084225d380335f27eb6598 (diff)
ogg muxer
Originally committed as revision 10999 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/oggenc.c')
-rw-r--r--libavformat/oggenc.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
new file mode 100644
index 0000000000..06c978ece2
--- /dev/null
+++ b/libavformat/oggenc.c
@@ -0,0 +1,227 @@
+/*
+ * Ogg muxer
+ * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
+ *
+ * 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 "avformat.h"
+#include "crc.h"
+#include "xiph.h"
+#include "bytestream.h"
+
+typedef struct {
+ int64_t duration;
+ unsigned page_counter;
+ uint8_t *header[3];
+ int header_len[3];
+ /** for theora granule */
+ int kfgshift;
+ int64_t last_kf_pts;
+ int vrev;
+} OGGStreamContext;
+
+static void ogg_update_checksum(AVFormatContext *s, offset_t crc_offset)
+{
+ offset_t pos = url_ftell(&s->pb);
+ uint32_t checksum = get_checksum(&s->pb);
+ url_fseek(&s->pb, crc_offset, SEEK_SET);
+ put_be32(&s->pb, checksum);
+ url_fseek(&s->pb, pos, SEEK_SET);
+}
+
+static int ogg_write_page(AVFormatContext *s, const uint8_t *data, int size,
+ int64_t granule, int stream_index, int flags)
+{
+ OGGStreamContext *oggstream = s->streams[stream_index]->priv_data;
+ offset_t crc_offset;
+ int page_segments, i;
+
+ size = FFMIN(size, 255*255);
+ page_segments = FFMIN((size/255)+!!size, 255);
+
+ init_checksum(&s->pb, ff_crc04C11DB7_update, 0);
+ put_tag(&s->pb, "OggS");
+ put_byte(&s->pb, 0);
+ put_byte(&s->pb, flags);
+ put_le64(&s->pb, granule);
+ put_le32(&s->pb, stream_index);
+ put_le32(&s->pb, oggstream->page_counter++);
+ crc_offset = url_ftell(&s->pb);
+ put_le32(&s->pb, 0); // crc
+ put_byte(&s->pb, page_segments);
+ for (i = 0; i < page_segments-1; i++)
+ put_byte(&s->pb, 255);
+ if (size) {
+ put_byte(&s->pb, size - (page_segments-1)*255);
+ put_buffer(&s->pb, data, size);
+ }
+ ogg_update_checksum(s, crc_offset);
+ put_flush_packet(&s->pb);
+ return size;
+}
+
+static int ogg_build_flac_headers(const uint8_t *extradata, int extradata_size,
+ OGGStreamContext *oggstream, int bitexact)
+{
+ const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
+ uint8_t *p;
+ if (extradata_size != 34)
+ return -1;
+ oggstream->header_len[0] = 79;
+ oggstream->header[0] = av_mallocz(79); // per ogg flac specs
+ p = oggstream->header[0];
+ bytestream_put_byte(&p, 0x7F);
+ bytestream_put_buffer(&p, "FLAC", 4);
+ bytestream_put_byte(&p, 1); // major version
+ bytestream_put_byte(&p, 0); // minor version
+ bytestream_put_be16(&p, 1); // headers packets without this one
+ bytestream_put_buffer(&p, "fLaC", 4);
+ bytestream_put_byte(&p, 0x00); // streaminfo
+ bytestream_put_be24(&p, 34);
+ bytestream_put_buffer(&p, extradata, 34);
+ oggstream->header_len[1] = 1+3+4+strlen(vendor)+4;
+ oggstream->header[1] = av_mallocz(oggstream->header_len[1]);
+ p = oggstream->header[1];
+ bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
+ bytestream_put_be24(&p, oggstream->header_len[1] - 4);
+ bytestream_put_le32(&p, strlen(vendor));
+ bytestream_put_buffer(&p, vendor, strlen(vendor));
+ bytestream_put_le32(&p, 0); // user comment list length
+ return 0;
+}
+
+static int ogg_write_header(AVFormatContext *s)
+{
+ OGGStreamContext *oggstream;
+ int i, j;
+ for (i = 0; i < s->nb_streams; i++) {
+ AVStream *st = s->streams[i];
+ if (st->codec->codec_type == CODEC_TYPE_AUDIO)
+ av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+ else if (st->codec->codec_type == CODEC_TYPE_VIDEO)
+ av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
+ if (st->codec->codec_id != CODEC_ID_VORBIS &&
+ st->codec->codec_id != CODEC_ID_THEORA &&
+ st->codec->codec_id != CODEC_ID_FLAC) {
+ av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
+ return -1;
+ }
+
+ if (!st->codec->extradata || !st->codec->extradata_size) {
+ av_log(s, AV_LOG_ERROR, "No extradata present\n");
+ return -1;
+ }
+ oggstream = av_mallocz(sizeof(*oggstream));
+ st->priv_data = oggstream;
+ if (st->codec->codec_id == CODEC_ID_FLAC) {
+ if (ogg_build_flac_headers(st->codec->extradata, st->codec->extradata_size,
+ oggstream, st->codec->flags & CODEC_FLAG_BITEXACT) < 0) {
+ av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
+ av_freep(&st->priv_data);
+ }
+ } else {
+ if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
+ st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
+ oggstream->header, oggstream->header_len) < 0) {
+ av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
+ av_freep(&st->priv_data);
+ return -1;
+ }
+ if (st->codec->codec_id == CODEC_ID_THEORA) {
+ /** KFGSHIFT is the width of the less significant section of the granule position
+ The less significant section is the frame count since the last keyframe */
+ oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
+ oggstream->vrev = oggstream->header[0][9];
+ av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
+ oggstream->kfgshift, oggstream->vrev);
+ }
+ }
+ }
+ for (i = 0; i < 3; i++) {
+ for (j = 0; j < s->nb_streams; j++) {
+ AVStream *st = s->streams[j];
+ OGGStreamContext *oggstream = st->priv_data;
+ if (oggstream && oggstream->header_len[i]) {
+ ogg_write_page(s, oggstream->header[i], oggstream->header_len[i],
+ 0, st->index, i ? 0 : 2); // bos
+ }
+ }
+ }
+ return 0;
+}
+
+static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ AVStream *st = s->streams[pkt->stream_index];
+ OGGStreamContext *oggstream = st->priv_data;
+ uint8_t *ptr = pkt->data;
+ int ret, size = pkt->size;
+ int64_t granule;
+
+ if (st->codec->codec_id == CODEC_ID_THEORA) {
+ int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
+ int pframe_count;
+ if (pkt->flags & PKT_FLAG_KEY)
+ oggstream->last_kf_pts = pts;
+ pframe_count = pts - oggstream->last_kf_pts;
+ // prevent frame count from overflow if key frame flag is not set
+ if (pframe_count >= (1<<oggstream->kfgshift)) {
+ oggstream->last_kf_pts += pframe_count;
+ pframe_count = 0;
+ }
+ granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
+ } else
+ granule = pkt->pts + pkt->duration;
+ oggstream->duration = granule;
+ do {
+ ret = ogg_write_page(s, ptr, size, granule, pkt->stream_index, ptr != pkt->data);
+ ptr += ret; size -= ret;
+ } while (size > 0 || ret == 255*255); // need to output a last nil page
+
+ return 0;
+}
+
+
+static int ogg_write_trailer(AVFormatContext *s)
+{
+ int i;
+ for (i = 0; i < s->nb_streams; i++) {
+ AVStream *st = s->streams[i];
+ OGGStreamContext *oggstream = st->priv_data;
+ ogg_write_page(s, NULL, 0, oggstream->duration, i, 4); // eos
+ if (st->codec->codec_id == CODEC_ID_FLAC) {
+ av_free(oggstream->header[0]);
+ av_free(oggstream->header[1]);
+ }
+ av_freep(&st->priv_data);
+ }
+ return 0;
+}
+
+AVOutputFormat ogg_muxer = {
+ "ogg",
+ "Ogg format",
+ "application/ogg",
+ "ogg",
+ 0,
+ CODEC_ID_FLAC,
+ CODEC_ID_THEORA,
+ ogg_write_header,
+ ogg_write_packet,
+ ogg_write_trailer,
+};