ffmpeg / libavformat / oggenc.c @ 95ca3b1e
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/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "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 "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 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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int64_t duration; |
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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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} 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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OGGPageList *page_list; |
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} OGGContext; |
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static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset) |
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{ |
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int64_t pos = url_ftell(s->pb); |
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uint32_t checksum = get_checksum(s->pb); |
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url_fseek(s->pb, crc_offset, SEEK_SET); |
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put_be32(s->pb, checksum); |
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url_fseek(s->pb, pos, SEEK_SET); |
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} |
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static void 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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int64_t crc_offset; |
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init_checksum(s->pb, ff_crc04C11DB7_update, 0);
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put_tag(s->pb, "OggS");
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put_byte(s->pb, 0);
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put_byte(s->pb, page->flags | extra_flags); |
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put_le64(s->pb, page->granule); |
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put_le32(s->pb, page->stream_index); |
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put_le32(s->pb, oggstream->page_counter++); |
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crc_offset = url_ftell(s->pb); |
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put_le32(s->pb, 0); // crc |
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put_byte(s->pb, page->segments_count); |
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put_buffer(s->pb, page->segments, page->segments_count); |
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put_buffer(s->pb, page->data, page->size); |
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ogg_update_checksum(s, crc_offset); |
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put_flush_packet(s->pb); |
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oggstream->page_count--; |
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} |
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static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, OGGPage *page)
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{ |
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if (oggstream->kfgshift)
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return (page->granule>>oggstream->kfgshift) +
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(page->granule & ((1<<oggstream->kfgshift)-1)); |
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else
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return page->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), |
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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), |
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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_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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{ |
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OGGStreamContext *oggstream = st->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;
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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 (page->segments_count == 255) { |
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ogg_buffer_page(s, oggstream); |
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} |
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} |
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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, AVMetadata *m)
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{ |
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const char *vendor = bitexact ? "ffmpeg" : 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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size = offset + ff_vorbiscomment_length(m, vendor, &count); |
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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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*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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AVMetadata *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 (!ff_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); |
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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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AVMetadata *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); |
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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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static int ogg_write_header(AVFormatContext *s) |
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{ |
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OGGStreamContext *oggstream; |
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int i, j;
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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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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
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av_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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av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
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if (st->codec->codec_id != CODEC_ID_VORBIS &&
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st->codec->codec_id != CODEC_ID_THEORA && |
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st->codec->codec_id != CODEC_ID_SPEEX && |
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st->codec->codec_id != CODEC_ID_FLAC) { |
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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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st->priv_data = oggstream; |
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if (st->codec->codec_id == 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 == 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 {
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if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
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st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42, |
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oggstream->header, oggstream->header_len) < 0) {
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av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
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av_freep(&st->priv_data); |
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return -1; |
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} |
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if (st->codec->codec_id == CODEC_ID_THEORA) {
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/** KFGSHIFT is the width of the less significant section of the granule position
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The less significant section is the frame count since the last keyframe */
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oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5); |
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oggstream->vrev = oggstream->header[0][9]; |
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av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
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oggstream->kfgshift, oggstream->vrev); |
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} |
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} |
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} |
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for (j = 0; j < s->nb_streams; j++) { |
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OGGStreamContext *oggstream = s->streams[j]->priv_data; |
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ogg_buffer_data(s, s->streams[j], oggstream->header[0],
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oggstream->header_len[0], 0); |
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oggstream->page.flags |= 2; // bos |
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ogg_buffer_page(s, oggstream); |
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} |
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for (j = 0; j < s->nb_streams; j++) { |
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AVStream *st = s->streams[j]; |
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OGGStreamContext *oggstream = st->priv_data; |
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for (i = 1; i < 3; i++) { |
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if (oggstream && oggstream->header_len[i])
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ogg_buffer_data(s, st, oggstream->header[i], |
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oggstream->header_len[i], 0);
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} |
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ogg_buffer_page(s, oggstream); |
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} |
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return 0; |
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} |
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static void ogg_write_pages(AVFormatContext *s, int flush) |
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{ |
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OGGContext *ogg = s->priv_data; |
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OGGPageList *next, *p; |
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if (!ogg->page_list)
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return;
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for (p = ogg->page_list; p; ) {
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OGGStreamContext *oggstream = |
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s->streams[p->page.stream_index]->priv_data; |
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if (oggstream->page_count < 2 && !flush) |
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break;
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ogg_write_page(s, &p->page, |
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flush && oggstream->page_count == 1 ? 4 : 0); // eos |
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next = p->next; |
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av_freep(&p); |
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p = next; |
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} |
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ogg->page_list = p; |
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} |
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static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVStream *st = s->streams[pkt->stream_index]; |
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OGGStreamContext *oggstream = st->priv_data; |
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int ret;
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int64_t granule; |
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if (st->codec->codec_id == CODEC_ID_THEORA) {
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int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
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int pframe_count;
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if (pkt->flags & AV_PKT_FLAG_KEY)
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oggstream->last_kf_pts = pts; |
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pframe_count = pts - oggstream->last_kf_pts; |
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// prevent frame count from overflow if key frame flag is not set
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if (pframe_count >= (1<<oggstream->kfgshift)) { |
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oggstream->last_kf_pts += pframe_count; |
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pframe_count = 0;
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} |
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granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count; |
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} else
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granule = pkt->pts + pkt->duration; |
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oggstream->duration = granule; |
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ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule); |
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if (ret < 0) |
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return ret;
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ogg_write_pages(s, 0);
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return 0; |
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} |
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static int ogg_write_trailer(AVFormatContext *s) |
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{ |
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int i;
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|
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/* flush current page */
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for (i = 0; i < s->nb_streams; i++) |
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ogg_buffer_page(s, s->streams[i]->priv_data); |
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ogg_write_pages(s, 1);
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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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OGGStreamContext *oggstream = st->priv_data; |
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if (st->codec->codec_id == CODEC_ID_FLAC ||
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st->codec->codec_id == CODEC_ID_SPEEX) { |
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av_free(oggstream->header[0]);
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av_free(oggstream->header[1]);
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} |
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av_freep(&st->priv_data); |
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} |
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return 0; |
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} |
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|
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AVOutputFormat ogg_muxer = { |
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"ogg",
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NULL_IF_CONFIG_SMALL("Ogg"),
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"application/ogg",
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"ogg,ogv,spx",
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sizeof(OGGContext),
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CODEC_ID_FLAC, |
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CODEC_ID_THEORA, |
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ogg_write_header, |
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ogg_write_packet, |
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ogg_write_trailer, |
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.metadata_conv = ff_vorbiscomment_metadata_conv, |
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}; |