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59220d559b
This uses page duration instead of byte size to determine when to buffer the page. Also, it tries to avoid continued pages by buffering the current page if there are already packets in the page and adding the next packet would require it to be continued on a new page. This can improve seeking performance. The default page duration is 1 second, which is much saner than filling all page segments by default.
624 lines
20 KiB
C
624 lines
20 KiB
C
/*
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* Ogg muxer
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* Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/crc.h"
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#include "libavutil/mathematics.h"
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#include "libavutil/opt.h"
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#include "libavutil/random_seed.h"
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#include "libavcodec/xiph.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "vorbiscomment.h"
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#define MAX_PAGE_SIZE 65025
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typedef struct {
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int64_t start_granule;
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int64_t granule;
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int stream_index;
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uint8_t flags;
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uint8_t segments_count;
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uint8_t segments[255];
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uint8_t data[MAX_PAGE_SIZE];
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uint16_t size;
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} OGGPage;
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typedef struct {
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unsigned page_counter;
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uint8_t *header[3];
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int header_len[3];
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/** for theora granule */
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int kfgshift;
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int64_t last_kf_pts;
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int vrev;
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int eos;
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unsigned page_count; ///< number of page buffered
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OGGPage page; ///< current page
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unsigned serial_num; ///< serial number
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int64_t last_granule; ///< last packet granule
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} OGGStreamContext;
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typedef struct OGGPageList {
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OGGPage page;
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struct OGGPageList *next;
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} OGGPageList;
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typedef struct {
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const AVClass *class;
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OGGPageList *page_list;
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int pref_size; ///< preferred page size (0 => fill all segments)
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int64_t pref_duration; ///< preferred page duration (0 => fill all segments)
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} OGGContext;
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#define OFFSET(x) offsetof(OGGContext, x)
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#define PARAM AV_OPT_FLAG_ENCODING_PARAM
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static const AVOption options[] = {
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{ "pagesize", "preferred page size in bytes (deprecated)",
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OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
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{ "page_duration", "preferred page duration, in microseconds",
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OFFSET(pref_duration), AV_OPT_TYPE_INT, { .i64 = 1000000 }, 0, INT64_MAX, PARAM },
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{ NULL },
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};
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static const AVClass ogg_muxer_class = {
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.class_name = "Ogg muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
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{
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int64_t pos = avio_tell(pb);
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uint32_t checksum = ffio_get_checksum(pb);
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avio_seek(pb, crc_offset, SEEK_SET);
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avio_wb32(pb, checksum);
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avio_seek(pb, pos, SEEK_SET);
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}
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static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
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{
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OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
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AVIOContext *pb;
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int64_t crc_offset;
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int ret, size;
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uint8_t *buf;
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ret = avio_open_dyn_buf(&pb);
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if (ret < 0)
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return ret;
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ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
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ffio_wfourcc(pb, "OggS");
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avio_w8(pb, 0);
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avio_w8(pb, page->flags | extra_flags);
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avio_wl64(pb, page->granule);
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avio_wl32(pb, oggstream->serial_num);
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avio_wl32(pb, oggstream->page_counter++);
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crc_offset = avio_tell(pb);
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avio_wl32(pb, 0); // crc
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avio_w8(pb, page->segments_count);
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avio_write(pb, page->segments, page->segments_count);
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avio_write(pb, page->data, page->size);
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ogg_update_checksum(s, pb, crc_offset);
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avio_flush(pb);
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size = avio_close_dyn_buf(pb, &buf);
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if (size < 0)
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return size;
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avio_write(s->pb, buf, size);
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avio_flush(s->pb);
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av_free(buf);
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oggstream->page_count--;
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return 0;
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}
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static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
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{
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if (oggstream->kfgshift)
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return (granule>>oggstream->kfgshift) +
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(granule & ((1<<oggstream->kfgshift)-1));
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else
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return granule;
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}
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static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
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{
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AVStream *st2 = s->streams[next->stream_index];
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AVStream *st = s->streams[page->stream_index];
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int64_t next_granule, cur_granule;
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if (next->granule == -1 || page->granule == -1)
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return 0;
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next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
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st2->time_base, AV_TIME_BASE_Q);
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cur_granule = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
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st ->time_base, AV_TIME_BASE_Q);
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return next_granule > cur_granule;
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}
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static int ogg_reset_cur_page(OGGStreamContext *oggstream)
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{
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oggstream->page.granule = -1;
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oggstream->page.flags = 0;
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oggstream->page.segments_count = 0;
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oggstream->page.size = 0;
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return 0;
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}
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static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
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{
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OGGContext *ogg = s->priv_data;
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OGGPageList **p = &ogg->page_list;
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OGGPageList *l = av_mallocz(sizeof(*l));
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if (!l)
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return AVERROR(ENOMEM);
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l->page = oggstream->page;
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oggstream->page.start_granule = oggstream->page.granule;
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oggstream->page_count++;
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ogg_reset_cur_page(oggstream);
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while (*p) {
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if (ogg_compare_granule(s, &(*p)->page, &l->page))
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break;
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p = &(*p)->next;
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}
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l->next = *p;
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*p = l;
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return 0;
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}
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static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
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uint8_t *data, unsigned size, int64_t granule,
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int header)
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{
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OGGStreamContext *oggstream = st->priv_data;
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OGGContext *ogg = s->priv_data;
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int total_segments = size / 255 + 1;
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uint8_t *p = data;
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int i, segments, len, flush = 0;
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// Handles VFR by flushing page because this frame needs to have a timestamp
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if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
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ogg_granule_to_timestamp(oggstream, granule) >
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ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) {
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if (oggstream->page.granule != -1)
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ogg_buffer_page(s, oggstream);
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flush = 1;
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}
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// avoid a continued page
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if (!header && oggstream->page.size > 0 &&
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MAX_PAGE_SIZE - oggstream->page.size < size) {
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ogg_buffer_page(s, oggstream);
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}
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for (i = 0; i < total_segments; ) {
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OGGPage *page = &oggstream->page;
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segments = FFMIN(total_segments - i, 255 - page->segments_count);
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if (i && !page->segments_count)
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page->flags |= 1; // continued packet
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memset(page->segments+page->segments_count, 255, segments - 1);
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page->segments_count += segments - 1;
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len = FFMIN(size, segments*255);
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page->segments[page->segments_count++] = len - (segments-1)*255;
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memcpy(page->data+page->size, p, len);
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p += len;
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size -= len;
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i += segments;
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page->size += len;
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if (i == total_segments)
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page->granule = granule;
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if (!header) {
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AVStream *st = s->streams[page->stream_index];
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int64_t start = av_rescale_q(page->start_granule, st->time_base,
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AV_TIME_BASE_Q);
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int64_t next = av_rescale_q(page->granule, st->time_base,
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AV_TIME_BASE_Q);
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if (page->segments_count == 255 ||
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(ogg->pref_size > 0 && page->size >= ogg->pref_size) ||
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(ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) {
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ogg_buffer_page(s, oggstream);
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}
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}
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}
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if (flush && oggstream->page.granule != -1)
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ogg_buffer_page(s, oggstream);
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return 0;
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}
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static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
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int *header_len, AVDictionary **m, int framing_bit)
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{
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const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
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int size;
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uint8_t *p, *p0;
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unsigned int count;
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ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
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size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
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p = av_mallocz(size);
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if (!p)
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return NULL;
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p0 = p;
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p += offset;
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ff_vorbiscomment_write(&p, m, vendor, count);
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if (framing_bit)
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bytestream_put_byte(&p, 1);
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*header_len = size;
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return p0;
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}
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static int ogg_build_flac_headers(AVCodecContext *avctx,
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OGGStreamContext *oggstream, int bitexact,
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AVDictionary **m)
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{
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enum FLACExtradataFormat format;
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uint8_t *streaminfo;
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uint8_t *p;
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if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
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return -1;
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// first packet: STREAMINFO
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oggstream->header_len[0] = 51;
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oggstream->header[0] = av_mallocz(51); // per ogg flac specs
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p = oggstream->header[0];
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if (!p)
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return AVERROR(ENOMEM);
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bytestream_put_byte(&p, 0x7F);
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bytestream_put_buffer(&p, "FLAC", 4);
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bytestream_put_byte(&p, 1); // major version
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bytestream_put_byte(&p, 0); // minor version
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bytestream_put_be16(&p, 1); // headers packets without this one
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bytestream_put_buffer(&p, "fLaC", 4);
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bytestream_put_byte(&p, 0x00); // streaminfo
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bytestream_put_be24(&p, 34);
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bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
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// second packet: VorbisComment
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p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
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if (!p)
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return AVERROR(ENOMEM);
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oggstream->header[1] = p;
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bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
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bytestream_put_be24(&p, oggstream->header_len[1] - 4);
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return 0;
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}
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#define SPEEX_HEADER_SIZE 80
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static int ogg_build_speex_headers(AVCodecContext *avctx,
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OGGStreamContext *oggstream, int bitexact,
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AVDictionary **m)
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{
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uint8_t *p;
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if (avctx->extradata_size < SPEEX_HEADER_SIZE)
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return -1;
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// first packet: Speex header
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p = av_mallocz(SPEEX_HEADER_SIZE);
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if (!p)
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return AVERROR(ENOMEM);
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oggstream->header[0] = p;
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oggstream->header_len[0] = SPEEX_HEADER_SIZE;
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bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
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AV_WL32(&oggstream->header[0][68], 0); // set extra_headers to 0
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// second packet: VorbisComment
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p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
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if (!p)
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return AVERROR(ENOMEM);
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oggstream->header[1] = p;
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return 0;
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}
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#define OPUS_HEADER_SIZE 19
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static int ogg_build_opus_headers(AVCodecContext *avctx,
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OGGStreamContext *oggstream, int bitexact,
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AVDictionary **m)
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{
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uint8_t *p;
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if (avctx->extradata_size < OPUS_HEADER_SIZE)
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return -1;
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/* first packet: Opus header */
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p = av_mallocz(avctx->extradata_size);
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if (!p)
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return AVERROR(ENOMEM);
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oggstream->header[0] = p;
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oggstream->header_len[0] = avctx->extradata_size;
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bytestream_put_buffer(&p, avctx->extradata, avctx->extradata_size);
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/* second packet: VorbisComment */
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p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
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if (!p)
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return AVERROR(ENOMEM);
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oggstream->header[1] = p;
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bytestream_put_buffer(&p, "OpusTags", 8);
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return 0;
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}
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static int ogg_write_header(AVFormatContext *s)
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{
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OGGContext *ogg = s->priv_data;
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OGGStreamContext *oggstream;
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int i, j;
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if (ogg->pref_size)
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av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n");
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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unsigned serial_num = i;
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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
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if (st->codec->codec_id == AV_CODEC_ID_OPUS)
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/* Opus requires a fixed 48kHz clock */
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avpriv_set_pts_info(st, 64, 1, 48000);
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else
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
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avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
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if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
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st->codec->codec_id != AV_CODEC_ID_THEORA &&
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st->codec->codec_id != AV_CODEC_ID_SPEEX &&
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st->codec->codec_id != AV_CODEC_ID_FLAC &&
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st->codec->codec_id != AV_CODEC_ID_OPUS) {
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av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
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return -1;
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}
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if (!st->codec->extradata || !st->codec->extradata_size) {
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av_log(s, AV_LOG_ERROR, "No extradata present\n");
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return -1;
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}
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oggstream = av_mallocz(sizeof(*oggstream));
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oggstream->page.stream_index = i;
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if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
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do {
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serial_num = av_get_random_seed();
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for (j = 0; j < i; j++) {
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OGGStreamContext *sc = s->streams[j]->priv_data;
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if (serial_num == sc->serial_num)
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break;
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}
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} while (j < i);
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oggstream->serial_num = serial_num;
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st->priv_data = oggstream;
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if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
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int err = ogg_build_flac_headers(st->codec, oggstream,
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st->codec->flags & CODEC_FLAG_BITEXACT,
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&s->metadata);
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if (err) {
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av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
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av_freep(&st->priv_data);
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return err;
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}
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} else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
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int err = ogg_build_speex_headers(st->codec, oggstream,
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st->codec->flags & CODEC_FLAG_BITEXACT,
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&s->metadata);
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if (err) {
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av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
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av_freep(&st->priv_data);
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return err;
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}
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} else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
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int err = ogg_build_opus_headers(st->codec, oggstream,
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st->codec->flags & CODEC_FLAG_BITEXACT,
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&s->metadata);
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if (err) {
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av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
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av_freep(&st->priv_data);
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return err;
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}
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} else {
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uint8_t *p;
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const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
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int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
|
|
int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
|
|
|
|
if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
|
|
st->codec->codec_id == AV_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;
|
|
}
|
|
|
|
p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
|
|
&oggstream->header_len[1], &s->metadata,
|
|
framing_bit);
|
|
oggstream->header[1] = p;
|
|
if (!p)
|
|
return AVERROR(ENOMEM);
|
|
|
|
bytestream_put_byte(&p, header_type);
|
|
bytestream_put_buffer(&p, cstr, 6);
|
|
|
|
if (st->codec->codec_id == AV_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 (j = 0; j < s->nb_streams; j++) {
|
|
OGGStreamContext *oggstream = s->streams[j]->priv_data;
|
|
ogg_buffer_data(s, s->streams[j], oggstream->header[0],
|
|
oggstream->header_len[0], 0, 1);
|
|
oggstream->page.flags |= 2; // bos
|
|
ogg_buffer_page(s, oggstream);
|
|
}
|
|
for (j = 0; j < s->nb_streams; j++) {
|
|
AVStream *st = s->streams[j];
|
|
OGGStreamContext *oggstream = st->priv_data;
|
|
for (i = 1; i < 3; i++) {
|
|
if (oggstream && oggstream->header_len[i])
|
|
ogg_buffer_data(s, st, oggstream->header[i],
|
|
oggstream->header_len[i], 0, 1);
|
|
}
|
|
ogg_buffer_page(s, oggstream);
|
|
}
|
|
|
|
oggstream->page.start_granule = AV_NOPTS_VALUE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ogg_write_pages(AVFormatContext *s, int flush)
|
|
{
|
|
OGGContext *ogg = s->priv_data;
|
|
OGGPageList *next, *p;
|
|
|
|
if (!ogg->page_list)
|
|
return;
|
|
|
|
for (p = ogg->page_list; p; ) {
|
|
OGGStreamContext *oggstream =
|
|
s->streams[p->page.stream_index]->priv_data;
|
|
if (oggstream->page_count < 2 && !flush)
|
|
break;
|
|
ogg_write_page(s, &p->page,
|
|
flush && oggstream->page_count == 1 ? 4 : 0); // eos
|
|
next = p->next;
|
|
av_freep(&p);
|
|
p = next;
|
|
}
|
|
ogg->page_list = p;
|
|
}
|
|
|
|
static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVStream *st = s->streams[pkt->stream_index];
|
|
OGGStreamContext *oggstream = st->priv_data;
|
|
int ret;
|
|
int64_t granule;
|
|
|
|
if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
|
|
int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
|
|
int pframe_count;
|
|
if (pkt->flags & AV_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 if (st->codec->codec_id == AV_CODEC_ID_OPUS)
|
|
granule = pkt->pts + pkt->duration + av_rescale_q(st->codec->delay, (AVRational){ 1, st->codec->sample_rate }, st->time_base);
|
|
else
|
|
granule = pkt->pts + pkt->duration;
|
|
|
|
if (oggstream->page.start_granule == AV_NOPTS_VALUE)
|
|
oggstream->page.start_granule = pkt->pts;
|
|
|
|
ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ogg_write_pages(s, 0);
|
|
|
|
oggstream->last_granule = granule;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ogg_write_trailer(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
|
|
/* flush current page if needed */
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
OGGStreamContext *oggstream = s->streams[i]->priv_data;
|
|
|
|
if (oggstream->page.size > 0)
|
|
ogg_buffer_page(s, oggstream);
|
|
}
|
|
|
|
ogg_write_pages(s, 1);
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
OGGStreamContext *oggstream = st->priv_data;
|
|
if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
|
|
st->codec->codec_id == AV_CODEC_ID_SPEEX ||
|
|
st->codec->codec_id == AV_CODEC_ID_OPUS) {
|
|
av_free(oggstream->header[0]);
|
|
}
|
|
av_freep(&oggstream->header[1]);
|
|
av_freep(&st->priv_data);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_ogg_muxer = {
|
|
.name = "ogg",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Ogg"),
|
|
.mime_type = "application/ogg",
|
|
.extensions = "ogg,ogv,spx,opus",
|
|
.priv_data_size = sizeof(OGGContext),
|
|
.audio_codec = AV_CODEC_ID_FLAC,
|
|
.video_codec = AV_CODEC_ID_THEORA,
|
|
.write_header = ogg_write_header,
|
|
.write_packet = ogg_write_packet,
|
|
.write_trailer = ogg_write_trailer,
|
|
.priv_class = &ogg_muxer_class,
|
|
};
|