| /* |
| * 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 "libavcodec/xiph.h" |
| #include "libavcodec/bytestream.h" |
| #include "libavcodec/flac.h" |
| #include "avformat.h" |
| #include "internal.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; |
| int eos; |
| } OGGStreamContext; |
| |
| static void ogg_update_checksum(AVFormatContext *s, int64_t crc_offset) |
| { |
| int64_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; |
| int64_t crc_offset; |
| int page_segments, i; |
| |
| if (size >= 255*255) { |
| granule = -1; |
| size = 255*255; |
| } else if (oggstream->eos) |
| flags |= 4; |
| |
| 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(AVCodecContext *avctx, |
| OGGStreamContext *oggstream, int bitexact) |
| { |
| const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT; |
| enum FLACExtradataFormat format; |
| uint8_t *streaminfo; |
| uint8_t *p; |
| if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo)) |
| return -1; |
| oggstream->header_len[0] = 51; |
| oggstream->header[0] = av_mallocz(51); // 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, streaminfo, FLAC_STREAMINFO_SIZE); |
| 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, |
| 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_compare_granule(AVFormatContext *s, AVPacket *next, AVPacket *pkt) |
| { |
| AVStream *st2 = s->streams[next->stream_index]; |
| AVStream *st = s->streams[pkt ->stream_index]; |
| |
| int64_t next_granule = av_rescale_q(next->pts + next->duration, |
| st2->time_base, AV_TIME_BASE_Q); |
| int64_t cur_granule = av_rescale_q(pkt ->pts + pkt ->duration, |
| st ->time_base, AV_TIME_BASE_Q); |
| return next_granule > cur_granule; |
| } |
| |
| static int ogg_interleave_per_granule(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush) |
| { |
| AVPacketList *pktl; |
| int stream_count = 0; |
| int streams[MAX_STREAMS] = {0}; |
| int interleaved = 0; |
| |
| if (pkt) { |
| ff_interleave_add_packet(s, pkt, ogg_compare_granule); |
| } |
| |
| pktl = s->packet_buffer; |
| while (pktl) { |
| if (streams[pktl->pkt.stream_index] == 0) |
| stream_count++; |
| streams[pktl->pkt.stream_index]++; |
| // need to buffer at least one packet to set eos flag |
| if (streams[pktl->pkt.stream_index] == 2) |
| interleaved++; |
| pktl = pktl->next; |
| } |
| |
| if ((s->nb_streams == stream_count && interleaved == stream_count) || |
| (flush && stream_count)) { |
| pktl= s->packet_buffer; |
| *out= pktl->pkt; |
| s->packet_buffer = pktl->next; |
| if (flush && streams[out->stream_index] == 1) { |
| OGGStreamContext *ogg = s->streams[out->stream_index]->priv_data; |
| ogg->eos = 1; |
| } |
| av_freep(&pktl); |
| return 1; |
| } else { |
| av_init_packet(out); |
| 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; |
| 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", |
| NULL_IF_CONFIG_SMALL("Ogg"), |
| "application/ogg", |
| "ogg,ogv", |
| 0, |
| CODEC_ID_FLAC, |
| CODEC_ID_THEORA, |
| ogg_write_header, |
| ogg_write_packet, |
| ogg_write_trailer, |
| .interleave_packet = ogg_interleave_per_granule, |
| }; |