| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP Depacketization of MP4A-LATM, RFC 3016 | ||
| 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 "avio_internal.h" | ||
| 23 | #include "rtpdec_formats.h" | ||
| 24 | #include "internal.h" | ||
| 25 | #include "libavutil/avstring.h" | ||
| 26 | #include "libavutil/mem.h" | ||
| 27 | #include "libavcodec/get_bits.h" | ||
| 28 | |||
| 29 | struct PayloadContext { | ||
| 30 | AVIOContext *dyn_buf; | ||
| 31 | uint8_t *buf; | ||
| 32 | int pos, len; | ||
| 33 | uint32_t timestamp; | ||
| 34 | }; | ||
| 35 | |||
| 36 | ✗ | static void latm_close_context(PayloadContext *data) | |
| 37 | { | ||
| 38 | ✗ | ffio_free_dyn_buf(&data->dyn_buf); | |
| 39 | ✗ | av_freep(&data->buf); | |
| 40 | ✗ | } | |
| 41 | |||
| 42 | ✗ | static int latm_parse_packet(AVFormatContext *ctx, PayloadContext *data, | |
| 43 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | ||
| 44 | const uint8_t *buf, int len, uint16_t seq, | ||
| 45 | int flags) | ||
| 46 | { | ||
| 47 | int ret, cur_len; | ||
| 48 | |||
| 49 | ✗ | if (buf) { | |
| 50 | ✗ | if (!data->dyn_buf || data->timestamp != *timestamp) { | |
| 51 | ✗ | av_freep(&data->buf); | |
| 52 | ✗ | ffio_free_dyn_buf(&data->dyn_buf); | |
| 53 | |||
| 54 | ✗ | data->timestamp = *timestamp; | |
| 55 | ✗ | if ((ret = avio_open_dyn_buf(&data->dyn_buf)) < 0) | |
| 56 | ✗ | return ret; | |
| 57 | } | ||
| 58 | ✗ | avio_write(data->dyn_buf, buf, len); | |
| 59 | |||
| 60 | ✗ | if (!(flags & RTP_FLAG_MARKER)) | |
| 61 | ✗ | return AVERROR(EAGAIN); | |
| 62 | ✗ | av_freep(&data->buf); | |
| 63 | ✗ | data->len = avio_close_dyn_buf(data->dyn_buf, &data->buf); | |
| 64 | ✗ | data->dyn_buf = NULL; | |
| 65 | ✗ | data->pos = 0; | |
| 66 | } | ||
| 67 | |||
| 68 | ✗ | if (!data->buf) { | |
| 69 | ✗ | av_log(ctx, AV_LOG_ERROR, "No data available yet\n"); | |
| 70 | ✗ | return AVERROR(EIO); | |
| 71 | } | ||
| 72 | |||
| 73 | ✗ | cur_len = 0; | |
| 74 | ✗ | while (data->pos < data->len) { | |
| 75 | ✗ | uint8_t val = data->buf[data->pos++]; | |
| 76 | ✗ | cur_len += val; | |
| 77 | ✗ | if (val != 0xff) | |
| 78 | ✗ | break; | |
| 79 | } | ||
| 80 | ✗ | if (data->pos + cur_len > data->len) { | |
| 81 | ✗ | av_log(ctx, AV_LOG_ERROR, "Malformed LATM packet\n"); | |
| 82 | ✗ | return AVERROR(EIO); | |
| 83 | } | ||
| 84 | |||
| 85 | ✗ | if ((ret = av_new_packet(pkt, cur_len)) < 0) | |
| 86 | ✗ | return ret; | |
| 87 | ✗ | memcpy(pkt->data, data->buf + data->pos, cur_len); | |
| 88 | ✗ | data->pos += cur_len; | |
| 89 | ✗ | pkt->stream_index = st->index; | |
| 90 | ✗ | return data->pos < data->len; | |
| 91 | } | ||
| 92 | |||
| 93 | ✗ | static int parse_fmtp_config(AVStream *st, const char *value) | |
| 94 | { | ||
| 95 | ✗ | int len = ff_hex_to_data(NULL, value), i, ret = 0; | |
| 96 | GetBitContext gb; | ||
| 97 | uint8_t *config; | ||
| 98 | int audio_mux_version, same_time_framing, num_programs, num_layers; | ||
| 99 | |||
| 100 | /* Pad this buffer, too, to avoid out of bounds reads with get_bits below */ | ||
| 101 | ✗ | config = av_mallocz(len + AV_INPUT_BUFFER_PADDING_SIZE); | |
| 102 | ✗ | if (!config) | |
| 103 | ✗ | return AVERROR(ENOMEM); | |
| 104 | ✗ | ff_hex_to_data(config, value); | |
| 105 | ✗ | ret = init_get_bits(&gb, config, len*8); | |
| 106 | ✗ | if (ret < 0) | |
| 107 | ✗ | return ret; | |
| 108 | ✗ | audio_mux_version = get_bits(&gb, 1); | |
| 109 | ✗ | same_time_framing = get_bits(&gb, 1); | |
| 110 | ✗ | skip_bits(&gb, 6); /* num_sub_frames */ | |
| 111 | ✗ | num_programs = get_bits(&gb, 4); | |
| 112 | ✗ | num_layers = get_bits(&gb, 3); | |
| 113 | ✗ | if (audio_mux_version != 0 || same_time_framing != 1 || num_programs != 0 || | |
| 114 | num_layers != 0) { | ||
| 115 | ✗ | avpriv_report_missing_feature(NULL, "LATM config (%d,%d,%d,%d)", | |
| 116 | audio_mux_version, same_time_framing, | ||
| 117 | num_programs, num_layers); | ||
| 118 | ✗ | ret = AVERROR_PATCHWELCOME; | |
| 119 | ✗ | goto end; | |
| 120 | } | ||
| 121 | ✗ | ret = ff_alloc_extradata(st->codecpar, (get_bits_left(&gb) + 7)/8); | |
| 122 | ✗ | if (ret < 0) { | |
| 123 | ✗ | goto end; | |
| 124 | } | ||
| 125 | ✗ | for (i = 0; i < st->codecpar->extradata_size; i++) | |
| 126 | ✗ | st->codecpar->extradata[i] = get_bits(&gb, 8); | |
| 127 | |||
| 128 | ✗ | end: | |
| 129 | ✗ | av_free(config); | |
| 130 | ✗ | return ret; | |
| 131 | } | ||
| 132 | |||
| 133 | ✗ | static int parse_fmtp(AVFormatContext *s, | |
| 134 | AVStream *stream, PayloadContext *data, | ||
| 135 | const char *attr, const char *value) | ||
| 136 | { | ||
| 137 | int res; | ||
| 138 | |||
| 139 | ✗ | if (!strcmp(attr, "config")) { | |
| 140 | ✗ | res = parse_fmtp_config(stream, value); | |
| 141 | ✗ | if (res < 0) | |
| 142 | ✗ | return res; | |
| 143 | ✗ | } else if (!strcmp(attr, "cpresent")) { | |
| 144 | ✗ | int cpresent = atoi(value); | |
| 145 | ✗ | if (cpresent != 0) | |
| 146 | ✗ | avpriv_request_sample(s, | |
| 147 | "RTP MP4A-LATM with in-band configuration"); | ||
| 148 | } | ||
| 149 | |||
| 150 | ✗ | return 0; | |
| 151 | } | ||
| 152 | |||
| 153 | ✗ | static int latm_parse_sdp_line(AVFormatContext *s, int st_index, | |
| 154 | PayloadContext *data, const char *line) | ||
| 155 | { | ||
| 156 | const char *p; | ||
| 157 | |||
| 158 | ✗ | if (st_index < 0) | |
| 159 | ✗ | return 0; | |
| 160 | |||
| 161 | ✗ | if (av_strstart(line, "fmtp:", &p)) | |
| 162 | ✗ | return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp); | |
| 163 | |||
| 164 | ✗ | return 0; | |
| 165 | } | ||
| 166 | |||
| 167 | const RTPDynamicProtocolHandler ff_mp4a_latm_dynamic_handler = { | ||
| 168 | .enc_name = "MP4A-LATM", | ||
| 169 | .codec_type = AVMEDIA_TYPE_AUDIO, | ||
| 170 | .codec_id = AV_CODEC_ID_AAC, | ||
| 171 | .priv_data_size = sizeof(PayloadContext), | ||
| 172 | .parse_sdp_a_line = latm_parse_sdp_line, | ||
| 173 | .close = latm_close_context, | ||
| 174 | .parse_packet = latm_parse_packet, | ||
| 175 | }; | ||
| 176 |