LCOV - code coverage report
Current view: top level - libavformat - flacenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 65 83 78.3 %
Date: 2017-12-15 18:13:28 Functions: 5 5 100.0 %

          Line data    Source code
       1             : /*
       2             :  * raw FLAC muxer
       3             :  * Copyright (c) 2006-2009 Justin Ruggles
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "libavutil/channel_layout.h"
      23             : #include "libavutil/opt.h"
      24             : #include "libavcodec/flac.h"
      25             : #include "avformat.h"
      26             : #include "avio_internal.h"
      27             : #include "flacenc.h"
      28             : #include "vorbiscomment.h"
      29             : #include "libavcodec/bytestream.h"
      30             : 
      31             : 
      32             : typedef struct FlacMuxerContext {
      33             :     const AVClass *class;
      34             :     int write_header;
      35             : 
      36             :     /* updated streaminfo sent by the encoder at the end */
      37             :     uint8_t *streaminfo;
      38             : } FlacMuxerContext;
      39             : 
      40          11 : static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
      41             :                                     int last_block)
      42             : {
      43          11 :     avio_w8(pb, last_block ? 0x81 : 0x01);
      44          11 :     avio_wb24(pb, n_padding_bytes);
      45          11 :     ffio_fill(pb, 0, n_padding_bytes);
      46          11 :     return 0;
      47             : }
      48             : 
      49          11 : static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
      50             :                                     int last_block, int bitexact)
      51             : {
      52          11 :     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
      53             :     int64_t len;
      54             :     uint8_t *p, *p0;
      55             : 
      56          11 :     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
      57             : 
      58          11 :     len = ff_vorbiscomment_length(*m, vendor);
      59          11 :     if (len >= ((1<<24) - 4))
      60           0 :         return AVERROR(EINVAL);
      61          11 :     p0 = av_malloc(len+4);
      62          11 :     if (!p0)
      63           0 :         return AVERROR(ENOMEM);
      64          11 :     p = p0;
      65             : 
      66          11 :     bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
      67          11 :     bytestream_put_be24(&p, len);
      68          11 :     ff_vorbiscomment_write(&p, m, vendor);
      69             : 
      70          11 :     avio_write(pb, p0, len+4);
      71          11 :     av_freep(&p0);
      72          11 :     p = NULL;
      73             : 
      74          11 :     return 0;
      75             : }
      76             : 
      77          11 : static int flac_write_header(struct AVFormatContext *s)
      78             : {
      79             :     int ret;
      80          11 :     int padding = s->metadata_header_padding;
      81          11 :     AVCodecParameters *par = s->streams[0]->codecpar;
      82          11 :     FlacMuxerContext *c   = s->priv_data;
      83             : 
      84          11 :     if (!c->write_header)
      85           0 :         return 0;
      86             : 
      87          11 :     if (s->nb_streams > 1) {
      88           0 :         av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
      89           0 :         return AVERROR(EINVAL);
      90             :     }
      91          11 :     if (par->codec_id != AV_CODEC_ID_FLAC) {
      92           0 :         av_log(s, AV_LOG_ERROR, "unsupported codec\n");
      93           0 :         return AVERROR(EINVAL);
      94             :     }
      95             : 
      96          11 :     if (padding < 0)
      97          11 :         padding = 8192;
      98             :     /* The FLAC specification states that 24 bits are used to represent the
      99             :      * size of a metadata block so we must clip this value to 2^24-1. */
     100          11 :     padding = av_clip_uintp2(padding, 24);
     101             : 
     102          11 :     ret = ff_flac_write_header(s->pb, par->extradata,
     103             :                                par->extradata_size, 0);
     104          11 :     if (ret)
     105           0 :         return ret;
     106             : 
     107             :     /* add the channel layout tag */
     108          22 :     if (par->channel_layout &&
     109          22 :         !(par->channel_layout & ~0x3ffffULL) &&
     110          11 :         !ff_flac_is_native_layout(par->channel_layout)) {
     111           0 :         AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
     112             :                                                 NULL, 0);
     113             : 
     114           0 :         if (chmask) {
     115           0 :             av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
     116             :                    "already present, this muxer will not overwrite it.\n");
     117             :         } else {
     118             :             uint8_t buf[32];
     119           0 :             snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
     120           0 :             av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
     121             :         }
     122             :     }
     123             : 
     124          11 :     ret = flac_write_block_comment(s->pb, &s->metadata, !padding,
     125          11 :                                    s->flags & AVFMT_FLAG_BITEXACT);
     126          11 :     if (ret)
     127           0 :         return ret;
     128             : 
     129             :     /* The command line flac encoder defaults to placing a seekpoint
     130             :      * every 10s.  So one might add padding to allow that later
     131             :      * but there seems to be no simple way to get the duration here.
     132             :      * So just add the amount requested by the user. */
     133          11 :     if (padding)
     134          11 :         flac_write_block_padding(s->pb, padding, 1);
     135             : 
     136          11 :     return ret;
     137             : }
     138             : 
     139          11 : static int flac_write_trailer(struct AVFormatContext *s)
     140             : {
     141          11 :     AVIOContext *pb = s->pb;
     142             :     int64_t file_size;
     143          11 :     FlacMuxerContext *c = s->priv_data;
     144          11 :     uint8_t *streaminfo = c->streaminfo ? c->streaminfo :
     145           0 :                                           s->streams[0]->codecpar->extradata;
     146             : 
     147          11 :     if (!c->write_header || !streaminfo)
     148           0 :         return 0;
     149             : 
     150          11 :     if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
     151             :         /* rewrite the STREAMINFO header block data */
     152          11 :         file_size = avio_tell(pb);
     153          11 :         avio_seek(pb, 8, SEEK_SET);
     154          11 :         avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
     155          11 :         avio_seek(pb, file_size, SEEK_SET);
     156          11 :         avio_flush(pb);
     157             :     } else {
     158           0 :         av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
     159             :     }
     160             : 
     161          11 :     av_freep(&c->streaminfo);
     162             : 
     163          11 :     return 0;
     164             : }
     165             : 
     166        1247 : static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
     167             : {
     168        1247 :     FlacMuxerContext *c = s->priv_data;
     169             :     uint8_t *streaminfo;
     170             :     int streaminfo_size;
     171             : 
     172             :     /* check for updated streaminfo */
     173        1247 :     streaminfo = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
     174             :                                          &streaminfo_size);
     175        1247 :     if (streaminfo && streaminfo_size == FLAC_STREAMINFO_SIZE) {
     176          11 :         av_freep(&c->streaminfo);
     177             : 
     178          11 :         c->streaminfo = av_malloc(FLAC_STREAMINFO_SIZE);
     179          11 :         if (!c->streaminfo)
     180           0 :             return AVERROR(ENOMEM);
     181          11 :         memcpy(c->streaminfo, streaminfo, FLAC_STREAMINFO_SIZE);
     182             :     }
     183             : 
     184        1247 :     if (pkt->size)
     185        1236 :         avio_write(s->pb, pkt->data, pkt->size);
     186        1247 :     return 0;
     187             : }
     188             : 
     189             : static const AVOption flacenc_options[] = {
     190             :     { "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
     191             :     { NULL },
     192             : };
     193             : 
     194             : static const AVClass flac_muxer_class = {
     195             :     .class_name = "flac muxer",
     196             :     .item_name  = av_default_item_name,
     197             :     .option     = flacenc_options,
     198             :     .version    = LIBAVUTIL_VERSION_INT,
     199             : };
     200             : 
     201             : AVOutputFormat ff_flac_muxer = {
     202             :     .name              = "flac",
     203             :     .long_name         = NULL_IF_CONFIG_SMALL("raw FLAC"),
     204             :     .priv_data_size    = sizeof(FlacMuxerContext),
     205             :     .mime_type         = "audio/x-flac",
     206             :     .extensions        = "flac",
     207             :     .audio_codec       = AV_CODEC_ID_FLAC,
     208             :     .video_codec       = AV_CODEC_ID_NONE,
     209             :     .write_header      = flac_write_header,
     210             :     .write_packet      = flac_write_packet,
     211             :     .write_trailer     = flac_write_trailer,
     212             :     .flags             = AVFMT_NOTIMESTAMPS,
     213             :     .priv_class        = &flac_muxer_class,
     214             : };

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