| /* |
| * 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" |
| #include "internal.h" |
| |
| static const char AMR_header [] = "#!AMR\n"; |
| static const char AMRWB_header [] = "#!AMR-WB\n"; |
| |
| #if CONFIG_AMR_MUXER |
| static int amr_write_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVCodecContext *enc = s->streams[0]->codec; |
| |
| s->priv_data = NULL; |
| |
| if (enc->codec_id == CODEC_ID_AMR_NB) |
| { |
| avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */ |
| } |
| else if(enc->codec_id == CODEC_ID_AMR_WB) |
| { |
| avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */ |
| } |
| else |
| { |
| return -1; |
| } |
| avio_flush(pb); |
| return 0; |
| } |
| |
| static int amr_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| avio_write(s->pb, pkt->data, pkt->size); |
| avio_flush(s->pb); |
| return 0; |
| } |
| #endif /* CONFIG_AMR_MUXER */ |
| |
| 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(memcmp(p->buf,AMR_header,5)==0) |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| } |
| |
| /* amr input */ |
| static int amr_read_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| uint8_t header[9]; |
| |
| avio_read(pb, header, 6); |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| { |
| return AVERROR(ENOMEM); |
| } |
| if(memcmp(header,AMR_header,6)!=0) |
| { |
| avio_read(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 = AVMEDIA_TYPE_AUDIO; |
| avpriv_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 = 0, toc, mode; |
| int64_t pos = avio_tell(s->pb); |
| |
| if (url_feof(s->pb)) |
| { |
| return AVERROR(EIO); |
| } |
| |
| //FIXME this is wrong, this should rather be in a AVParset |
| toc=avio_r8(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(EIO); |
| } |
| |
| /* Both AMR formats have 50 frames per second */ |
| s->streams[0]->codec->bit_rate = size*8*50; |
| |
| pkt->stream_index = 0; |
| pkt->pos = pos; |
| pkt->data[0]=toc; |
| pkt->duration= enc->codec_id == CODEC_ID_AMR_NB ? 160 : 320; |
| read = avio_read(s->pb, pkt->data+1, size-1); |
| |
| if (read != size-1) |
| { |
| av_free_packet(pkt); |
| return AVERROR(EIO); |
| } |
| |
| return 0; |
| } |
| |
| #if CONFIG_AMR_DEMUXER |
| AVInputFormat ff_amr_demuxer = { |
| .name = "amr", |
| .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR file format"), |
| .read_probe = amr_probe, |
| .read_header = amr_read_header, |
| .read_packet = amr_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |
| #endif |
| |
| #if CONFIG_AMR_MUXER |
| AVOutputFormat ff_amr_muxer = { |
| .name = "amr", |
| .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR file format"), |
| .mime_type = "audio/amr", |
| .extensions = "amr", |
| .audio_codec = CODEC_ID_AMR_NB, |
| .video_codec = CODEC_ID_NONE, |
| .write_header = amr_write_header, |
| .write_packet = amr_write_packet, |
| }; |
| #endif |