/* * 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 "libavutil/crc.h" #include "libavutil/random_seed.h" #include "libavcodec/xiph.h" #include "libavcodec/bytestream.h" #include "libavcodec/flac.h" #include "avformat.h" #include "internal.h" #include "vorbiscomment.h" #define MAX_PAGE_SIZE 65025 typedef struct { int64_t granule; int stream_index; uint8_t flags; uint8_t segments_count; uint8_t segments[255]; uint8_t data[MAX_PAGE_SIZE]; uint16_t size; } OGGPage; typedef struct { unsigned page_counter; uint8_t *header[3]; int header_len[3]; /** for theora granule */ int kfgshift; int64_t last_kf_pts; int vrev; int eos; unsigned page_count; ///< number of page buffered OGGPage page; ///< current page unsigned serial_num; ///< serial number int64_t last_granule; ///< last packet granule } OGGStreamContext; typedef struct OGGPageList { OGGPage page; struct OGGPageList *next; } OGGPageList; typedef struct { OGGPageList *page_list; } OGGContext; static void ogg_update_checksum(AVFormatContext *s, ByteIOContext *pb, int64_t crc_offset) { int64_t pos = url_ftell(pb); uint32_t checksum = get_checksum(pb); url_fseek(pb, crc_offset, SEEK_SET); put_be32(pb, checksum); url_fseek(pb, pos, SEEK_SET); } static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags) { OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data; ByteIOContext *pb; int64_t crc_offset; int ret, size; uint8_t *buf; ret = url_open_dyn_buf(&pb); if (ret < 0) return ret; init_checksum(pb, ff_crc04C11DB7_update, 0); put_tag(pb, "OggS"); put_byte(pb, 0); put_byte(pb, page->flags | extra_flags); put_le64(pb, page->granule); put_le32(pb, oggstream->serial_num); put_le32(pb, oggstream->page_counter++); crc_offset = url_ftell(pb); put_le32(pb, 0); // crc put_byte(pb, page->segments_count); put_buffer(pb, page->segments, page->segments_count); put_buffer(pb, page->data, page->size); ogg_update_checksum(s, pb, crc_offset); put_flush_packet(pb); size = url_close_dyn_buf(pb, &buf); if (size < 0) return size; put_buffer(s->pb, buf, size); put_flush_packet(s->pb); av_free(buf); oggstream->page_count--; return 0; } static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule) { if (oggstream->kfgshift) return (granule>>oggstream->kfgshift) + (granule & ((1<<oggstream->kfgshift)-1)); else return granule; } static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page) { AVStream *st2 = s->streams[next->stream_index]; AVStream *st = s->streams[page->stream_index]; int64_t next_granule, cur_granule; if (next->granule == -1 || page->granule == -1) return 0; next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule), st2->time_base, AV_TIME_BASE_Q); cur_granule = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule), st ->time_base, AV_TIME_BASE_Q); return next_granule > cur_granule; } static int ogg_reset_cur_page(OGGStreamContext *oggstream) { oggstream->page.granule = -1; oggstream->page.flags = 0; oggstream->page.segments_count = 0; oggstream->page.size = 0; return 0; } static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream) { OGGContext *ogg = s->priv_data; OGGPageList **p = &ogg->page_list; OGGPageList *l = av_mallocz(sizeof(*l)); if (!l) return AVERROR(ENOMEM); l->page = oggstream->page; oggstream->page_count++; ogg_reset_cur_page(oggstream); while (*p) { if (ogg_compare_granule(s, &(*p)->page, &l->page)) break; p = &(*p)->next; } l->next = *p; *p = l; return 0; } static int ogg_buffer_data(AVFormatContext *s, AVStream *st, uint8_t *data, unsigned size, int64_t granule) { OGGStreamContext *oggstream = st->priv_data; int total_segments = size / 255 + 1; uint8_t *p = data; int i, segments, len, flush = 0; // Handles VFR by flushing page because this frame needs to have a timestamp if (st->codec->codec_id == CODEC_ID_THEORA && ogg_granule_to_timestamp(oggstream, granule) > ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) { if (oggstream->page.granule != -1) ogg_buffer_page(s, oggstream); flush = 1; } for (i = 0; i < total_segments; ) { OGGPage *page = &oggstream->page; segments = FFMIN(total_segments - i, 255 - page->segments_count); if (i && !page->segments_count) page->flags |= 1; // continued packet memset(page->segments+page->segments_count, 255, segments - 1); page->segments_count += segments - 1; len = FFMIN(size, segments*255); page->segments[page->segments_count++] = len - (segments-1)*255; memcpy(page->data+page->size, p, len); p += len; size -= len; i += segments; page->size += len; if (i == total_segments) page->granule = granule; if (page->segments_count == 255) { ogg_buffer_page(s, oggstream); } } if (flush && oggstream->page.granule != -1) ogg_buffer_page(s, oggstream); return 0; } static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact, int *header_len, AVMetadata **m, int framing_bit) { const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT; int size; uint8_t *p, *p0; unsigned int count; ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL); size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit; p = av_mallocz(size); if (!p) return NULL; p0 = p; p += offset; ff_vorbiscomment_write(&p, m, vendor, count); if (framing_bit) bytestream_put_byte(&p, 1); *header_len = size; return p0; } static int ogg_build_flac_headers(AVCodecContext *avctx, OGGStreamContext *oggstream, int bitexact, AVMetadata **m) { enum FLACExtradataFormat format; uint8_t *streaminfo; uint8_t *p; if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo)) return -1; // first packet: STREAMINFO oggstream->header_len[0] = 51; oggstream->header[0] = av_mallocz(51); // per ogg flac specs p = oggstream->header[0]; if (!p) return AVERROR(ENOMEM); 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, streaminfo, FLAC_STREAMINFO_SIZE); // second packet: VorbisComment p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0); if (!p) return AVERROR(ENOMEM); oggstream->header[1] = p; bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment bytestream_put_be24(&p, oggstream->header_len[1] - 4); return 0; } #define SPEEX_HEADER_SIZE 80 static int ogg_build_speex_headers(AVCodecContext *avctx, OGGStreamContext *oggstream, int bitexact, AVMetadata **m) { uint8_t *p; if (avctx->extradata_size < SPEEX_HEADER_SIZE) return -1; // first packet: Speex header p = av_mallocz(SPEEX_HEADER_SIZE); if (!p) return AVERROR(ENOMEM); oggstream->header[0] = p; oggstream->header_len[0] = SPEEX_HEADER_SIZE; bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE); AV_WL32(&oggstream->header[0][68], 0); // set extra_headers to 0 // second packet: VorbisComment p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0); if (!p) return AVERROR(ENOMEM); oggstream->header[1] = p; 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]; unsigned serial_num = i; if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) av_set_pts_info(st, 64, 1, st->codec->sample_rate); else if (st->codec->codec_type == AVMEDIA_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_SPEEX && 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)); oggstream->page.stream_index = i; if (!(st->codec->flags & CODEC_FLAG_BITEXACT)) do { serial_num = av_get_random_seed(); for (j = 0; j < i; j++) { OGGStreamContext *sc = s->streams[j]->priv_data; if (serial_num == sc->serial_num) break; } } while (j < i); oggstream->serial_num = serial_num; st->priv_data = oggstream; if (st->codec->codec_id == CODEC_ID_FLAC) { int err = ogg_build_flac_headers(st->codec, oggstream, st->codec->flags & CODEC_FLAG_BITEXACT, &s->metadata); if (err) { av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n"); av_freep(&st->priv_data); return err; } } else if (st->codec->codec_id == CODEC_ID_SPEEX) { int err = ogg_build_speex_headers(st->codec, oggstream, st->codec->flags & CODEC_FLAG_BITEXACT, &s->metadata); if (err) { av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n"); av_freep(&st->priv_data); return err; } } else { uint8_t *p; const char *cstr = st->codec->codec_id == CODEC_ID_VORBIS ? "vorbis" : "theora"; int header_type = st->codec->codec_id == CODEC_ID_VORBIS ? 3 : 0x81; int framing_bit = st->codec->codec_id == CODEC_ID_VORBIS ? 1 : 0; 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; } p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT, &oggstream->header_len[1], &s->metadata, framing_bit); if (!p) return AVERROR(ENOMEM); oggstream->header[1] = p; bytestream_put_byte(&p, header_type); bytestream_put_buffer(&p, cstr, 6); 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 (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); 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); } ogg_buffer_page(s, oggstream); } 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 == 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 granule = pkt->pts + pkt->duration; ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule); 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 */ for (i = 0; i < s->nb_streams; i++) ogg_buffer_page(s, s->streams[i]->priv_data); 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 == CODEC_ID_FLAC || st->codec->codec_id == CODEC_ID_SPEEX) { av_free(oggstream->header[0]); av_free(oggstream->header[1]); } av_freep(&st->priv_data); } return 0; } AVOutputFormat ff_ogg_muxer = { "ogg", NULL_IF_CONFIG_SMALL("Ogg"), "application/ogg", "ogg,ogv,spx", sizeof(OGGContext), CODEC_ID_FLAC, CODEC_ID_THEORA, ogg_write_header, ogg_write_packet, ogg_write_trailer, };