diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/amr.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/amr.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/amr.c b/contrib/ffmpeg/libavformat/amr.c new file mode 100644 index 000000000..635a898fa --- /dev/null +++ b/contrib/ffmpeg/libavformat/amr.c @@ -0,0 +1,201 @@ +/* + * amr file format + * Copyright (c) 2001 ffmpeg project + * + * 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 + */ + +/* +Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267 + +Only mono files are supported. + +*/ +#include "avformat.h" + +static const char AMR_header [] = "#!AMR\n"; +static const char AMRWB_header [] = "#!AMR-WB\n"; + +#ifdef CONFIG_MUXERS +static int amr_write_header(AVFormatContext *s) +{ + ByteIOContext *pb = &s->pb; + AVCodecContext *enc = s->streams[0]->codec; + + s->priv_data = NULL; + + if (enc->codec_id == CODEC_ID_AMR_NB) + { + put_tag(pb, AMR_header); /* magic number */ + } + else if(enc->codec_id == CODEC_ID_AMR_WB) + { + put_tag(pb, AMRWB_header); /* magic number */ + } + else + { + return -1; + } + put_flush_packet(pb); + return 0; +} + +static int amr_write_packet(AVFormatContext *s, AVPacket *pkt) +{ + put_buffer(&s->pb, pkt->data, pkt->size); + put_flush_packet(&s->pb); + return 0; +} + +static int amr_write_trailer(AVFormatContext *s) +{ + return 0; +} +#endif /* CONFIG_MUXERS */ + +static int amr_probe(AVProbeData *p) +{ + //Only check for "#!AMR" which could be amr-wb, amr-nb. + //This will also trigger multichannel files: "#!AMR_MC1.0\n" and + //"#!AMR-WB_MC1.0\n" (not supported) + + if (p->buf_size < 5) + return 0; + if(memcmp(p->buf,AMR_header,5)==0) + return AVPROBE_SCORE_MAX; + else + return 0; +} + +/* amr input */ +static int amr_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + ByteIOContext *pb = &s->pb; + AVStream *st; + uint8_t header[9]; + + get_buffer(pb, header, 6); + + st = av_new_stream(s, 0); + if (!st) + { + return AVERROR_NOMEM; + } + if(memcmp(header,AMR_header,6)!=0) + { + get_buffer(pb, header+6, 3); + if(memcmp(header,AMRWB_header,9)!=0) + { + return -1; + } + + st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b'); + st->codec->codec_id = CODEC_ID_AMR_WB; + st->codec->sample_rate = 16000; + } + else + { + st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r'); + st->codec->codec_id = CODEC_ID_AMR_NB; + st->codec->sample_rate = 8000; + } + st->codec->channels = 1; + st->codec->codec_type = CODEC_TYPE_AUDIO; + av_set_pts_info(st, 64, 1, st->codec->sample_rate); + + return 0; +} + +static int amr_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + AVCodecContext *enc = s->streams[0]->codec; + int read, size, toc, mode; + + if (url_feof(&s->pb)) + { + return AVERROR_IO; + } + +//FIXME this is wrong, this should rather be in a AVParset + toc=get_byte(&s->pb); + mode = (toc >> 3) & 0x0F; + + if (enc->codec_id == CODEC_ID_AMR_NB) + { + static const uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0}; + + size=packed_size[mode]+1; + } + else if(enc->codec_id == CODEC_ID_AMR_WB) + { + static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1}; + + size=packed_size[mode]; + } + else + { + assert(0); + } + + if ( (size==0) || av_new_packet(pkt, size)) + { + return AVERROR_IO; + } + + pkt->stream_index = 0; + pkt->pos= url_ftell(&s->pb); + pkt->data[0]=toc; + pkt->duration= enc->codec_id == CODEC_ID_AMR_NB ? 160 : 320; + read = get_buffer(&s->pb, pkt->data+1, size-1); + + if (read != size-1) + { + av_free_packet(pkt); + return AVERROR_IO; + } + + return 0; +} + +#ifdef CONFIG_AMR_DEMUXER +AVInputFormat amr_demuxer = { + "amr", + "3gpp amr file format", + 0, /*priv_data_size*/ + amr_probe, + amr_read_header, + amr_read_packet, + NULL, +}; +#endif + +#ifdef CONFIG_AMR_MUXER +AVOutputFormat amr_muxer = { + "amr", + "3gpp amr file format", + "audio/amr", + "amr", + 0, + CODEC_ID_AMR_NB, + CODEC_ID_NONE, + amr_write_header, + amr_write_packet, + amr_write_trailer, +}; +#endif |