| /* |
| * 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 "libavutil/channel_layout.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "rawenc.h" |
| |
| typedef struct { |
| uint64_t cumulated_size; |
| uint64_t block_count; |
| } AMRContext; |
| |
| static const char AMR_header[] = "#!AMR\n"; |
| static const char AMRWB_header[] = "#!AMR-WB\n"; |
| |
| static const uint8_t amrnb_packed_size[16] = { |
| 13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1 |
| }; |
| static const uint8_t amrwb_packed_size[16] = { |
| 18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1 |
| }; |
| |
| #if CONFIG_AMR_MUXER |
| static int amr_write_header(AVFormatContext *s) |
| { |
| AVIOContext *pb = s->pb; |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| |
| s->priv_data = NULL; |
| |
| if (par->codec_id == AV_CODEC_ID_AMR_NB) { |
| avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */ |
| } else if (par->codec_id == AV_CODEC_ID_AMR_WB) { |
| avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */ |
| } else { |
| return -1; |
| } |
| return 0; |
| } |
| #endif /* CONFIG_AMR_MUXER */ |
| |
| static int amr_probe(const 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)) |
| 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]; |
| |
| if (avio_read(pb, header, 6) != 6) |
| return AVERROR_INVALIDDATA; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| if (memcmp(header, AMR_header, 6)) { |
| if (avio_read(pb, header + 6, 3) != 3) |
| return AVERROR_INVALIDDATA; |
| if (memcmp(header, AMRWB_header, 9)) { |
| return -1; |
| } |
| |
| st->codecpar->codec_tag = MKTAG('s', 'a', 'w', 'b'); |
| st->codecpar->codec_id = AV_CODEC_ID_AMR_WB; |
| st->codecpar->sample_rate = 16000; |
| } else { |
| st->codecpar->codec_tag = MKTAG('s', 'a', 'm', 'r'); |
| st->codecpar->codec_id = AV_CODEC_ID_AMR_NB; |
| st->codecpar->sample_rate = 8000; |
| } |
| st->codecpar->channels = 1; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| static int amr_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| int read, size = 0, toc, mode; |
| int64_t pos = avio_tell(s->pb); |
| AMRContext *amr = s->priv_data; |
| |
| if (avio_feof(s->pb)) { |
| return AVERROR_EOF; |
| } |
| |
| // FIXME this is wrong, this should rather be in an AVParser |
| toc = avio_r8(s->pb); |
| mode = (toc >> 3) & 0x0F; |
| |
| if (par->codec_id == AV_CODEC_ID_AMR_NB) { |
| size = amrnb_packed_size[mode]; |
| } else if (par->codec_id == AV_CODEC_ID_AMR_WB) { |
| size = amrwb_packed_size[mode]; |
| } |
| |
| if (!size || av_new_packet(pkt, size)) |
| return AVERROR(EIO); |
| |
| if (amr->cumulated_size < UINT64_MAX - size) { |
| amr->cumulated_size += size; |
| /* Both AMR formats have 50 frames per second */ |
| s->streams[0]->codecpar->bit_rate = amr->cumulated_size / ++amr->block_count * 8 * 50; |
| } |
| |
| pkt->stream_index = 0; |
| pkt->pos = pos; |
| pkt->data[0] = toc; |
| pkt->duration = par->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320; |
| read = avio_read(s->pb, pkt->data + 1, size - 1); |
| |
| if (read != size - 1) { |
| if (read < 0) |
| return read; |
| return AVERROR(EIO); |
| } |
| |
| return 0; |
| } |
| |
| #if CONFIG_AMR_DEMUXER |
| AVInputFormat ff_amr_demuxer = { |
| .name = "amr", |
| .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"), |
| .priv_data_size = sizeof(AMRContext), |
| .read_probe = amr_probe, |
| .read_header = amr_read_header, |
| .read_packet = amr_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |
| #endif |
| |
| #if CONFIG_AMRNB_DEMUXER |
| static int amrnb_probe(const AVProbeData *p) |
| { |
| int mode, i = 0, valid = 0, invalid = 0; |
| const uint8_t *b = p->buf; |
| |
| while (i < p->buf_size) { |
| mode = b[i] >> 3 & 0x0F; |
| if (mode < 9 && (b[i] & 0x4) == 0x4) { |
| int last = b[i]; |
| int size = amrnb_packed_size[mode]; |
| while (size--) { |
| if (b[++i] != last) |
| break; |
| } |
| if (size > 0) { |
| valid++; |
| i += size; |
| } |
| } else { |
| valid = 0; |
| invalid++; |
| i++; |
| } |
| } |
| if (valid > 100 && valid >> 4 > invalid) |
| return AVPROBE_SCORE_EXTENSION / 2 + 1; |
| return 0; |
| } |
| |
| static int amrnb_read_header(AVFormatContext *s) |
| { |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codecpar->codec_id = AV_CODEC_ID_AMR_NB; |
| st->codecpar->sample_rate = 8000; |
| st->codecpar->channels = 1; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| avpriv_set_pts_info(st, 64, 1, 8000); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_amrnb_demuxer = { |
| .name = "amrnb", |
| .long_name = NULL_IF_CONFIG_SMALL("raw AMR-NB"), |
| .priv_data_size = sizeof(AMRContext), |
| .read_probe = amrnb_probe, |
| .read_header = amrnb_read_header, |
| .read_packet = amr_read_packet, |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |
| #endif |
| |
| #if CONFIG_AMRWB_DEMUXER |
| static int amrwb_probe(const AVProbeData *p) |
| { |
| int mode, i = 0, valid = 0, invalid = 0; |
| const uint8_t *b = p->buf; |
| |
| while (i < p->buf_size) { |
| mode = b[i] >> 3 & 0x0F; |
| if (mode < 10 && (b[i] & 0x4) == 0x4) { |
| int last = b[i]; |
| int size = amrwb_packed_size[mode]; |
| while (size--) { |
| if (b[++i] != last) |
| break; |
| } |
| if (size > 0) { |
| valid++; |
| i += size; |
| } |
| } else { |
| valid = 0; |
| invalid++; |
| i++; |
| } |
| } |
| if (valid > 100 && valid >> 4 > invalid) |
| return AVPROBE_SCORE_EXTENSION / 2 + 1; |
| return 0; |
| } |
| |
| static int amrwb_read_header(AVFormatContext *s) |
| { |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codecpar->codec_id = AV_CODEC_ID_AMR_WB; |
| st->codecpar->sample_rate = 16000; |
| st->codecpar->channels = 1; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| avpriv_set_pts_info(st, 64, 1, 16000); |
| |
| return 0; |
| } |
| |
| AVInputFormat ff_amrwb_demuxer = { |
| .name = "amrwb", |
| .long_name = NULL_IF_CONFIG_SMALL("raw AMR-WB"), |
| .priv_data_size = sizeof(AMRContext), |
| .read_probe = amrwb_probe, |
| .read_header = amrwb_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"), |
| .mime_type = "audio/amr", |
| .extensions = "amr", |
| .audio_codec = AV_CODEC_ID_AMR_NB, |
| .video_codec = AV_CODEC_ID_NONE, |
| .write_header = amr_write_header, |
| .write_packet = ff_raw_write_packet, |
| .flags = AVFMT_NOTIMESTAMPS, |
| }; |
| #endif |