diff options
Diffstat (limited to 'ffmpeg1/libavformat/amr.c')
| -rw-r--r-- | ffmpeg1/libavformat/amr.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/ffmpeg1/libavformat/amr.c b/ffmpeg1/libavformat/amr.c deleted file mode 100644 index 07ab1ba..0000000 --- a/ffmpeg1/libavformat/amr.c +++ /dev/null @@ -1,182 +0,0 @@ -/* - * 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/avassert.h" -#include "libavutil/channel_layout.h" -#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 == AV_CODEC_ID_AMR_NB) { - avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */ - } else if (enc->codec_id == AV_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)) - 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)) { - avio_read(pb, header + 6, 3); - if (memcmp(header, AMRWB_header, 9)) { - return -1; - } - - st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b'); - st->codec->codec_id = AV_CODEC_ID_AMR_WB; - st->codec->sample_rate = 16000; - } else { - st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r'); - st->codec->codec_id = AV_CODEC_ID_AMR_NB; - st->codec->sample_rate = 8000; - } - st->codec->channels = 1; - st->codec->channel_layout = AV_CH_LAYOUT_MONO; - 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 == AV_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 == AV_CODEC_ID_AMR_WB) { - static const 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 { - av_assert0(0); - } - - if (!size || 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 == AV_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"), - .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"), - .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 = amr_write_packet, -}; -#endif |