| /* |
| * raw FLAC muxer |
| * Copyright (c) 2006-2009 Justin Ruggles |
| * |
| * 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/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/pixdesc.h" |
| #include "libavcodec/flac.h" |
| #include "avformat.h" |
| #include "avio_internal.h" |
| #include "flacenc.h" |
| #include "id3v2.h" |
| #include "internal.h" |
| #include "vorbiscomment.h" |
| #include "libavcodec/bytestream.h" |
| |
| |
| typedef struct FlacMuxerContext { |
| const AVClass *class; |
| int write_header; |
| |
| int audio_stream_idx; |
| int waiting_pics; |
| /* audio packets are queued here until we get all the attached pictures */ |
| AVPacketList *queue, *queue_end; |
| |
| /* updated streaminfo sent by the encoder at the end */ |
| uint8_t *streaminfo; |
| |
| unsigned attached_types; |
| } FlacMuxerContext; |
| |
| static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes, |
| int last_block) |
| { |
| avio_w8(pb, last_block ? 0x81 : 0x01); |
| avio_wb24(pb, n_padding_bytes); |
| ffio_fill(pb, 0, n_padding_bytes); |
| return 0; |
| } |
| |
| static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m, |
| int last_block, int bitexact) |
| { |
| const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT; |
| int64_t len; |
| uint8_t *p, *p0; |
| |
| ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL); |
| |
| len = ff_vorbiscomment_length(*m, vendor, NULL, 0); |
| if (len >= ((1<<24) - 4)) |
| return AVERROR(EINVAL); |
| p0 = av_malloc(len+4); |
| if (!p0) |
| return AVERROR(ENOMEM); |
| p = p0; |
| |
| bytestream_put_byte(&p, last_block ? 0x84 : 0x04); |
| bytestream_put_be24(&p, len); |
| ff_vorbiscomment_write(&p, m, vendor, NULL, 0); |
| |
| avio_write(pb, p0, len+4); |
| av_freep(&p0); |
| p = NULL; |
| |
| return 0; |
| } |
| |
| static int flac_write_picture(struct AVFormatContext *s, AVPacket *pkt) |
| { |
| FlacMuxerContext *c = s->priv_data; |
| AVIOContext *pb = s->pb; |
| const AVPixFmtDescriptor *pixdesc; |
| const CodecMime *mime = ff_id3v2_mime_tags; |
| AVDictionaryEntry *e; |
| const char *mimetype = NULL, *desc = ""; |
| const AVStream *st = s->streams[pkt->stream_index]; |
| int i, mimelen, desclen, type = 0; |
| |
| if (!pkt->data) |
| return 0; |
| |
| while (mime->id != AV_CODEC_ID_NONE) { |
| if (mime->id == st->codecpar->codec_id) { |
| mimetype = mime->str; |
| break; |
| } |
| mime++; |
| } |
| if (!mimetype) { |
| av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot " |
| "write an attached picture.\n", st->index); |
| return AVERROR(EINVAL); |
| } |
| mimelen = strlen(mimetype); |
| |
| /* get the picture type */ |
| e = av_dict_get(st->metadata, "comment", NULL, 0); |
| for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) { |
| if (!av_strcasecmp(e->value, ff_id3v2_picture_types[i])) { |
| type = i; |
| break; |
| } |
| } |
| |
| if ((c->attached_types & (1 << type)) & 0x6) { |
| av_log(s, AV_LOG_ERROR, "Duplicate attachment for type '%s'\n", ff_id3v2_picture_types[type]); |
| return AVERROR(EINVAL); |
| } |
| |
| if (type == 1 && (st->codecpar->codec_id != AV_CODEC_ID_PNG || |
| st->codecpar->width != 32 || |
| st->codecpar->height != 32)) { |
| av_log(s, AV_LOG_ERROR, "File icon attachment must be a 32x32 PNG"); |
| return AVERROR(EINVAL); |
| } |
| |
| c->attached_types |= (1 << type); |
| |
| /* get the description */ |
| if ((e = av_dict_get(st->metadata, "title", NULL, 0))) |
| desc = e->value; |
| desclen = strlen(desc); |
| |
| avio_w8(pb, 0x06); |
| avio_wb24(pb, 4 + 4 + mimelen + 4 + desclen + 4 + 4 + 4 + 4 + 4 + pkt->size); |
| |
| avio_wb32(pb, type); |
| |
| avio_wb32(pb, mimelen); |
| avio_write(pb, mimetype, mimelen); |
| |
| avio_wb32(pb, desclen); |
| avio_write(pb, desc, desclen); |
| |
| avio_wb32(pb, st->codecpar->width); |
| avio_wb32(pb, st->codecpar->height); |
| if ((pixdesc = av_pix_fmt_desc_get(st->codecpar->format))) |
| avio_wb32(pb, av_get_bits_per_pixel(pixdesc)); |
| else |
| avio_wb32(pb, 0); |
| avio_wb32(pb, 0); |
| |
| avio_wb32(pb, pkt->size); |
| avio_write(pb, pkt->data, pkt->size); |
| return 0; |
| } |
| |
| static int flac_finish_header(struct AVFormatContext *s) |
| { |
| int i, ret, padding = s->metadata_header_padding; |
| if (padding < 0) |
| padding = 8192; |
| /* The FLAC specification states that 24 bits are used to represent the |
| * size of a metadata block so we must clip this value to 2^24-1. */ |
| padding = av_clip_uintp2(padding, 24); |
| |
| for (i = 0; i < s->nb_streams; i++) { |
| AVStream *st = s->streams[i]; |
| AVPacket *pkt = st->priv_data; |
| if (!pkt) |
| continue; |
| ret = flac_write_picture(s, pkt); |
| av_packet_unref(pkt); |
| if (ret < 0 && (s->error_recognition & AV_EF_EXPLODE)) |
| return ret; |
| } |
| |
| ret = flac_write_block_comment(s->pb, &s->metadata, !padding, |
| s->flags & AVFMT_FLAG_BITEXACT); |
| if (ret) |
| return ret; |
| |
| /* The command line flac encoder defaults to placing a seekpoint |
| * every 10s. So one might add padding to allow that later |
| * but there seems to be no simple way to get the duration here. |
| * So just add the amount requested by the user. */ |
| if (padding) |
| flac_write_block_padding(s->pb, padding, 1); |
| |
| return 0; |
| } |
| |
| static int flac_init(struct AVFormatContext *s) |
| { |
| AVCodecParameters *par; |
| FlacMuxerContext *c = s->priv_data; |
| int i; |
| |
| c->audio_stream_idx = -1; |
| for (i = 0; i < s->nb_streams; i++) { |
| AVStream *st = s->streams[i]; |
| if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) { |
| if (c->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_FLAC) { |
| av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one FLAC " |
| "audio stream is required.\n"); |
| return AVERROR(EINVAL); |
| } |
| par = s->streams[i]->codecpar; |
| c->audio_stream_idx = i; |
| } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { |
| if (!(st->disposition & AV_DISPOSITION_ATTACHED_PIC)) { |
| av_log(s, AV_LOG_WARNING, "Video stream #%d is not an attached picture. Ignoring\n", i); |
| continue; |
| } else if (st->codecpar->codec_id == AV_CODEC_ID_GIF) { |
| av_log(s, AV_LOG_ERROR, "GIF image support is not implemented.\n"); |
| return AVERROR_PATCHWELCOME; |
| } else if (!c->write_header) { |
| av_log(s, AV_LOG_ERROR, "Can't write attached pictures without a header.\n"); |
| return AVERROR(EINVAL); |
| } |
| c->waiting_pics++; |
| } else { |
| av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in FLAC.\n"); |
| return AVERROR(EINVAL); |
| } |
| } |
| if (c->audio_stream_idx < 0) { |
| av_log(s, AV_LOG_ERROR, "No audio stream present.\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| /* add the channel layout tag */ |
| if (par->channel_layout && |
| !(par->channel_layout & ~0x3ffffULL) && |
| !ff_flac_is_native_layout(par->channel_layout)) { |
| AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", |
| NULL, 0); |
| |
| if (chmask) { |
| av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is " |
| "already present, this muxer will not overwrite it.\n"); |
| } else { |
| uint8_t buf[32]; |
| snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout); |
| av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int flac_write_header(struct AVFormatContext *s) |
| { |
| FlacMuxerContext *c = s->priv_data; |
| AVCodecParameters *par = s->streams[c->audio_stream_idx]->codecpar; |
| int ret; |
| |
| if (!c->write_header) |
| return 0; |
| |
| ret = ff_flac_write_header(s->pb, par->extradata, |
| par->extradata_size, 0); |
| if (ret < 0) |
| return ret; |
| |
| if (!c->waiting_pics) |
| ret = flac_finish_header(s); |
| |
| return ret; |
| } |
| |
| static int flac_write_audio_packet(struct AVFormatContext *s, AVPacket *pkt) |
| { |
| FlacMuxerContext *c = s->priv_data; |
| uint8_t *streaminfo; |
| int streaminfo_size; |
| |
| /* check for updated streaminfo */ |
| streaminfo = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, |
| &streaminfo_size); |
| if (streaminfo && streaminfo_size == FLAC_STREAMINFO_SIZE) { |
| av_freep(&c->streaminfo); |
| |
| c->streaminfo = av_malloc(FLAC_STREAMINFO_SIZE); |
| if (!c->streaminfo) |
| return AVERROR(ENOMEM); |
| memcpy(c->streaminfo, streaminfo, FLAC_STREAMINFO_SIZE); |
| } |
| |
| if (pkt->size) |
| avio_write(s->pb, pkt->data, pkt->size); |
| return 0; |
| } |
| |
| static int flac_queue_flush(AVFormatContext *s) |
| { |
| FlacMuxerContext *c = s->priv_data; |
| AVPacket pkt; |
| int ret, write = 1; |
| |
| ret = flac_finish_header(s); |
| if (ret < 0) |
| write = 0; |
| |
| while (c->queue) { |
| ff_packet_list_get(&c->queue, &c->queue_end, &pkt); |
| if (write && (ret = flac_write_audio_packet(s, &pkt)) < 0) |
| write = 0; |
| av_packet_unref(&pkt); |
| } |
| return ret; |
| } |
| |
| static int flac_write_trailer(struct AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| int64_t file_size; |
| FlacMuxerContext *c = s->priv_data; |
| uint8_t *streaminfo = c->streaminfo ? c->streaminfo : |
| s->streams[c->audio_stream_idx]->codecpar->extradata; |
| |
| if (c->waiting_pics) { |
| av_log(s, AV_LOG_WARNING, "No packets were sent for some of the " |
| "attached pictures.\n"); |
| flac_queue_flush(s); |
| } |
| |
| if (!c->write_header || !streaminfo) |
| return 0; |
| |
| if (pb->seekable & AVIO_SEEKABLE_NORMAL) { |
| /* rewrite the STREAMINFO header block data */ |
| file_size = avio_tell(pb); |
| avio_seek(pb, 8, SEEK_SET); |
| avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE); |
| avio_seek(pb, file_size, SEEK_SET); |
| avio_flush(pb); |
| } else { |
| av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n"); |
| } |
| |
| av_freep(&c->streaminfo); |
| |
| return 0; |
| } |
| |
| static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt) |
| { |
| FlacMuxerContext *c = s->priv_data; |
| int ret; |
| |
| if (pkt->stream_index == c->audio_stream_idx) { |
| if (c->waiting_pics) { |
| /* buffer audio packets until we get all the pictures */ |
| ret = ff_packet_list_put(&c->queue, &c->queue_end, pkt, FF_PACKETLIST_FLAG_REF_PACKET); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "Out of memory in packet queue; skipping attached pictures\n"); |
| c->waiting_pics = 0; |
| ret = flac_queue_flush(s); |
| if (ret < 0) |
| return ret; |
| return flac_write_audio_packet(s, pkt); |
| } |
| } else |
| return flac_write_audio_packet(s, pkt); |
| } else { |
| AVStream *st = s->streams[pkt->stream_index]; |
| |
| if (!c->waiting_pics || |
| !(st->disposition & AV_DISPOSITION_ATTACHED_PIC)) |
| return 0; |
| |
| /* warn only once for each stream */ |
| if (st->nb_frames == 1) { |
| av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d," |
| " ignoring.\n", pkt->stream_index); |
| } |
| if (st->nb_frames >= 1) |
| return 0; |
| |
| st->priv_data = av_packet_clone(pkt); |
| if (!st->priv_data) |
| av_log(s, AV_LOG_ERROR, "Out of memory queueing an attached picture; skipping\n"); |
| c->waiting_pics--; |
| |
| /* flush the buffered audio packets */ |
| if (!c->waiting_pics && |
| (ret = flac_queue_flush(s)) < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const AVOption flacenc_options[] = { |
| { "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM }, |
| { NULL }, |
| }; |
| |
| static const AVClass flac_muxer_class = { |
| .class_name = "flac muxer", |
| .item_name = av_default_item_name, |
| .option = flacenc_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVOutputFormat ff_flac_muxer = { |
| .name = "flac", |
| .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"), |
| .priv_data_size = sizeof(FlacMuxerContext), |
| .mime_type = "audio/x-flac", |
| .extensions = "flac", |
| .audio_codec = AV_CODEC_ID_FLAC, |
| .video_codec = AV_CODEC_ID_PNG, |
| .init = flac_init, |
| .write_header = flac_write_header, |
| .write_packet = flac_write_packet, |
| .write_trailer = flac_write_trailer, |
| .flags = AVFMT_NOTIMESTAMPS, |
| .priv_class = &flac_muxer_class, |
| }; |
