| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP AMR Depacketizer, RFC 3267 | ||
| 3 | * Copyright (c) 2010 Martin Storsjo | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/channel_layout.h" | ||
| 23 | #include "avformat.h" | ||
| 24 | #include "rtpdec_formats.h" | ||
| 25 | #include "libavutil/avstring.h" | ||
| 26 | |||
| 27 | static const uint8_t frame_sizes_nb[16] = { | ||
| 28 | 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 | ||
| 29 | }; | ||
| 30 | static const uint8_t frame_sizes_wb[16] = { | ||
| 31 | 17, 23, 32, 36, 40, 46, 50, 58, 60, 5, 5, 0, 0, 0, 0, 0 | ||
| 32 | }; | ||
| 33 | |||
| 34 | struct PayloadContext { | ||
| 35 | int octet_align; | ||
| 36 | int crc; | ||
| 37 | int interleaving; | ||
| 38 | int channels; | ||
| 39 | }; | ||
| 40 | |||
| 41 | ✗ | static av_cold int amr_init(AVFormatContext *s, int st_index, PayloadContext *data) | |
| 42 | { | ||
| 43 | ✗ | data->channels = 1; | |
| 44 | ✗ | return 0; | |
| 45 | } | ||
| 46 | |||
| 47 | ✗ | static int amr_handle_packet(AVFormatContext *ctx, PayloadContext *data, | |
| 48 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | ||
| 49 | const uint8_t *buf, int len, uint16_t seq, | ||
| 50 | int flags) | ||
| 51 | { | ||
| 52 | ✗ | const uint8_t *frame_sizes = NULL; | |
| 53 | int frames; | ||
| 54 | int i, ret; | ||
| 55 | const uint8_t *speech_data; | ||
| 56 | uint8_t *ptr; | ||
| 57 | |||
| 58 | ✗ | if (st->codecpar->codec_id == AV_CODEC_ID_AMR_NB) { | |
| 59 | ✗ | frame_sizes = frame_sizes_nb; | |
| 60 | ✗ | } else if (st->codecpar->codec_id == AV_CODEC_ID_AMR_WB) { | |
| 61 | ✗ | frame_sizes = frame_sizes_wb; | |
| 62 | } else { | ||
| 63 | ✗ | av_log(ctx, AV_LOG_ERROR, "Bad codec ID\n"); | |
| 64 | ✗ | return AVERROR_INVALIDDATA; | |
| 65 | } | ||
| 66 | |||
| 67 | ✗ | if (st->codecpar->ch_layout.nb_channels != 1) { | |
| 68 | ✗ | av_log(ctx, AV_LOG_ERROR, "Only mono AMR is supported\n"); | |
| 69 | ✗ | return AVERROR_INVALIDDATA; | |
| 70 | } | ||
| 71 | ✗ | av_channel_layout_default(&st->codecpar->ch_layout, 1); | |
| 72 | |||
| 73 | /* The AMR RTP packet consists of one header byte, followed | ||
| 74 | * by one TOC byte for each AMR frame in the packet, followed | ||
| 75 | * by the speech data for all the AMR frames. | ||
| 76 | * | ||
| 77 | * The header byte contains only a codec mode request, for | ||
| 78 | * requesting what kind of AMR data the sender wants to | ||
| 79 | * receive. Not used at the moment. | ||
| 80 | */ | ||
| 81 | |||
| 82 | /* Count the number of frames in the packet. The highest bit | ||
| 83 | * is set in a TOC byte if there are more frames following. | ||
| 84 | */ | ||
| 85 | ✗ | for (frames = 1; frames < len && (buf[frames] & 0x80); frames++) ; | |
| 86 | |||
| 87 | ✗ | if (1 + frames >= len) { | |
| 88 | /* We hit the end of the packet while counting frames. */ | ||
| 89 | ✗ | av_log(ctx, AV_LOG_ERROR, "No speech data found\n"); | |
| 90 | ✗ | return AVERROR_INVALIDDATA; | |
| 91 | } | ||
| 92 | |||
| 93 | ✗ | speech_data = buf + 1 + frames; | |
| 94 | |||
| 95 | /* Everything except the codec mode request byte should be output. */ | ||
| 96 | ✗ | if ((ret = av_new_packet(pkt, len - 1)) < 0) { | |
| 97 | ✗ | av_log(ctx, AV_LOG_ERROR, "Out of memory\n"); | |
| 98 | ✗ | return ret; | |
| 99 | } | ||
| 100 | ✗ | pkt->stream_index = st->index; | |
| 101 | ✗ | ptr = pkt->data; | |
| 102 | |||
| 103 | ✗ | for (i = 0; i < frames; i++) { | |
| 104 | ✗ | uint8_t toc = buf[1 + i]; | |
| 105 | ✗ | int frame_size = frame_sizes[(toc >> 3) & 0x0f]; | |
| 106 | |||
| 107 | ✗ | if (speech_data + frame_size > buf + len) { | |
| 108 | /* Too little speech data */ | ||
| 109 | ✗ | av_log(ctx, AV_LOG_WARNING, "Too little speech data in the RTP packet\n"); | |
| 110 | /* Set the unwritten part of the packet to zero. */ | ||
| 111 | ✗ | memset(ptr, 0, pkt->data + pkt->size - ptr); | |
| 112 | ✗ | pkt->size = ptr - pkt->data; | |
| 113 | ✗ | return 0; | |
| 114 | } | ||
| 115 | |||
| 116 | /* Extract the AMR frame mode from the TOC byte */ | ||
| 117 | ✗ | *ptr++ = toc & 0x7C; | |
| 118 | |||
| 119 | /* Copy the speech data */ | ||
| 120 | ✗ | memcpy(ptr, speech_data, frame_size); | |
| 121 | ✗ | speech_data += frame_size; | |
| 122 | ✗ | ptr += frame_size; | |
| 123 | } | ||
| 124 | |||
| 125 | ✗ | if (speech_data < buf + len) { | |
| 126 | ✗ | av_log(ctx, AV_LOG_WARNING, "Too much speech data in the RTP packet?\n"); | |
| 127 | /* Set the unwritten part of the packet to zero. */ | ||
| 128 | ✗ | memset(ptr, 0, pkt->data + pkt->size - ptr); | |
| 129 | ✗ | pkt->size = ptr - pkt->data; | |
| 130 | } | ||
| 131 | |||
| 132 | ✗ | return 0; | |
| 133 | } | ||
| 134 | |||
| 135 | ✗ | static int amr_parse_fmtp(AVFormatContext *s, | |
| 136 | AVStream *stream, PayloadContext *data, | ||
| 137 | const char *attr, const char *value) | ||
| 138 | { | ||
| 139 | /* Some AMR SDP configurations contain "octet-align", without | ||
| 140 | * the trailing =1. Therefore, if the value is empty, | ||
| 141 | * interpret it as "1". | ||
| 142 | */ | ||
| 143 | ✗ | if (!strcmp(value, "")) { | |
| 144 | ✗ | av_log(s, AV_LOG_WARNING, "AMR fmtp attribute %s had " | |
| 145 | "nonstandard empty value\n", attr); | ||
| 146 | ✗ | value = "1"; | |
| 147 | } | ||
| 148 | ✗ | if (!strcmp(attr, "octet-align")) | |
| 149 | ✗ | data->octet_align = atoi(value); | |
| 150 | ✗ | else if (!strcmp(attr, "crc")) | |
| 151 | ✗ | data->crc = atoi(value); | |
| 152 | ✗ | else if (!strcmp(attr, "interleaving")) | |
| 153 | ✗ | data->interleaving = atoi(value); | |
| 154 | ✗ | else if (!strcmp(attr, "channels")) | |
| 155 | ✗ | data->channels = atoi(value); | |
| 156 | ✗ | return 0; | |
| 157 | } | ||
| 158 | |||
| 159 | ✗ | static int amr_parse_sdp_line(AVFormatContext *s, int st_index, | |
| 160 | PayloadContext *data, const char *line) | ||
| 161 | { | ||
| 162 | const char *p; | ||
| 163 | int ret; | ||
| 164 | |||
| 165 | ✗ | if (st_index < 0) | |
| 166 | ✗ | return 0; | |
| 167 | |||
| 168 | /* Parse an fmtp line this one: | ||
| 169 | * a=fmtp:97 octet-align=1; interleaving=0 | ||
| 170 | * That is, a normal fmtp: line followed by semicolon & space | ||
| 171 | * separated key/value pairs. | ||
| 172 | */ | ||
| 173 | ✗ | if (av_strstart(line, "fmtp:", &p)) { | |
| 174 | ✗ | ret = ff_parse_fmtp(s, s->streams[st_index], data, p, amr_parse_fmtp); | |
| 175 | ✗ | if (!data->octet_align || data->crc || | |
| 176 | ✗ | data->interleaving || data->channels != 1) { | |
| 177 | ✗ | av_log(s, AV_LOG_ERROR, "Unsupported RTP/AMR configuration!\n"); | |
| 178 | ✗ | return -1; | |
| 179 | } | ||
| 180 | ✗ | return ret; | |
| 181 | } | ||
| 182 | ✗ | return 0; | |
| 183 | } | ||
| 184 | |||
| 185 | const RTPDynamicProtocolHandler ff_amr_nb_dynamic_handler = { | ||
| 186 | .enc_name = "AMR", | ||
| 187 | .codec_type = AVMEDIA_TYPE_AUDIO, | ||
| 188 | .codec_id = AV_CODEC_ID_AMR_NB, | ||
| 189 | .priv_data_size = sizeof(PayloadContext), | ||
| 190 | .init = amr_init, | ||
| 191 | .parse_sdp_a_line = amr_parse_sdp_line, | ||
| 192 | .parse_packet = amr_handle_packet, | ||
| 193 | }; | ||
| 194 | |||
| 195 | const RTPDynamicProtocolHandler ff_amr_wb_dynamic_handler = { | ||
| 196 | .enc_name = "AMR-WB", | ||
| 197 | .codec_type = AVMEDIA_TYPE_AUDIO, | ||
| 198 | .codec_id = AV_CODEC_ID_AMR_WB, | ||
| 199 | .priv_data_size = sizeof(PayloadContext), | ||
| 200 | .init = amr_init, | ||
| 201 | .parse_sdp_a_line = amr_parse_sdp_line, | ||
| 202 | .parse_packet = amr_handle_packet, | ||
| 203 | }; | ||
| 204 |