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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * G.729 raw format demuxer |
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| 3 | * Copyright (c) 2011 Vladimir Voroshilov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "avformat.h" |
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| 23 | #include "internal.h" |
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| 24 | #include "libavutil/log.h" |
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| 25 | #include "libavutil/opt.h" |
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| 26 | |||
| 27 | typedef struct G729DemuxerContext { |
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| 28 | AVClass *class; |
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| 29 | int bit_rate; |
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| 30 | } G729DemuxerContext; |
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| 31 | |||
| 32 | static int g729_read_header(AVFormatContext *s) |
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| 33 | { |
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| 34 | AVStream* st; |
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| 35 | G729DemuxerContext *s1 = s->priv_data; |
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| 36 | |||
| 37 | st = avformat_new_stream(s, NULL); |
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| 38 | if (!st) |
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| 39 | return AVERROR(ENOMEM); |
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| 40 | |||
| 41 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 42 | st->codec->codec_id = AV_CODEC_ID_G729; |
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| 43 | st->codec->sample_rate = 8000; |
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| 44 | st->codec->channels = 1; |
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| 45 | |||
| 46 | if (s1 && s1->bit_rate) { |
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| 47 | s->bit_rate = s1->bit_rate; |
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| 48 | } |
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| 49 | |||
| 50 | if (s->bit_rate == 0) { |
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| 51 | av_log(s, AV_LOG_DEBUG, "No bitrate specified. Assuming 8000 b/s\n"); |
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| 52 | s->bit_rate = 8000; |
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| 53 | } |
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| 54 | |||
| 55 | if (s->bit_rate == 6400) { |
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| 56 | st->codec->block_align = 8; |
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| 57 | } else if (s->bit_rate == 8000) { |
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| 58 | st->codec->block_align = 10; |
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| 59 | } else { |
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| 60 | av_log(s, AV_LOG_ERROR, "Only 8000 b/s and 6400 b/s bitrates are supported. Provided: %d b/s\n", s->bit_rate); |
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| 61 | return AVERROR_INVALIDDATA; |
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| 62 | } |
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| 63 | |||
| 64 | avpriv_set_pts_info(st, st->codec->block_align << 3, 1, st->codec->sample_rate); |
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| 65 | return 0; |
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| 66 | } |
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| 67 | static int g729_read_packet(AVFormatContext *s, AVPacket *pkt) |
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| 68 | { |
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| 69 | int ret; |
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| 70 | |||
| 71 | ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); |
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| 72 | |||
| 73 | pkt->stream_index = 0; |
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| 74 | if (ret < 0) |
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| 75 | return ret; |
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| 76 | |||
| 77 | pkt->dts = pkt->pts = pkt->pos / s->streams[0]->codec->block_align; |
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| 78 | |||
| 79 | return ret; |
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| 80 | } |
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| 81 | |||
| 82 | static const AVOption g729_options[] = { |
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| 83 | { "bit_rate", "", offsetof(G729DemuxerContext, bit_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
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| 84 | { NULL }, |
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| 85 | }; |
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| 86 | |||
| 87 | static const AVClass g729_demuxer_class = { |
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| 88 | .class_name = "g729 demuxer", |
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| 89 | .item_name = av_default_item_name, |
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| 90 | .option = g729_options, |
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| 91 | .version = LIBAVUTIL_VERSION_INT, |
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| 92 | }; |
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| 93 | |||
| 94 | AVInputFormat ff_g729_demuxer = { |
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| 95 | .name = "g729", |
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| 96 | .long_name = NULL_IF_CONFIG_SMALL("G.729 raw format demuxer"), |
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| 97 | .priv_data_size = sizeof(G729DemuxerContext), |
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| 98 | .read_header = g729_read_header, |
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| 99 | .read_packet = g729_read_packet, |
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| 100 | .flags = AVFMT_GENERIC_INDEX, |
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| 101 | .extensions = "g729", |
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| 102 | .priv_class = &g729_demuxer_class, |
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| 103 | }; |