| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP parser for AC3 payload format (RFC 4184) | ||
| 3 | * Copyright (c) 2015 Gilles Chanteperdrix <gch@xenomai.org> | ||
| 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 "avformat.h" | ||
| 23 | #include "avio_internal.h" | ||
| 24 | #include "rtpdec_formats.h" | ||
| 25 | |||
| 26 | #define RTP_AC3_PAYLOAD_HEADER_SIZE 2 | ||
| 27 | |||
| 28 | struct PayloadContext { | ||
| 29 | unsigned nr_frames; | ||
| 30 | unsigned last_frame; | ||
| 31 | uint32_t timestamp; | ||
| 32 | AVIOContext *fragment; | ||
| 33 | }; | ||
| 34 | |||
| 35 | ✗ | static void ac3_close_context(PayloadContext *data) | |
| 36 | { | ||
| 37 | ✗ | ffio_free_dyn_buf(&data->fragment); | |
| 38 | ✗ | } | |
| 39 | |||
| 40 | ✗ | static int ac3_handle_packet(AVFormatContext *ctx, PayloadContext *data, | |
| 41 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | ||
| 42 | const uint8_t *buf, int len, uint16_t seq, | ||
| 43 | int flags) | ||
| 44 | { | ||
| 45 | unsigned frame_type; | ||
| 46 | unsigned nr_frames; | ||
| 47 | int err; | ||
| 48 | |||
| 49 | ✗ | if (len < RTP_AC3_PAYLOAD_HEADER_SIZE + 1) { | |
| 50 | ✗ | av_log(ctx, AV_LOG_ERROR, "Invalid %d bytes packet\n", len); | |
| 51 | ✗ | return AVERROR_INVALIDDATA; | |
| 52 | } | ||
| 53 | |||
| 54 | ✗ | frame_type = buf[0] & 0x3; | |
| 55 | ✗ | nr_frames = buf[1]; | |
| 56 | ✗ | buf += RTP_AC3_PAYLOAD_HEADER_SIZE; | |
| 57 | ✗ | len -= RTP_AC3_PAYLOAD_HEADER_SIZE; | |
| 58 | |||
| 59 | ✗ | switch (frame_type) { | |
| 60 | ✗ | case 0: /* One or more complete frames */ | |
| 61 | ✗ | if (!nr_frames) { | |
| 62 | ✗ | av_log(ctx, AV_LOG_ERROR, "Invalid AC3 packet data\n"); | |
| 63 | ✗ | return AVERROR_INVALIDDATA; | |
| 64 | } | ||
| 65 | ✗ | if ((err = av_new_packet(pkt, len)) < 0) { | |
| 66 | ✗ | av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); | |
| 67 | ✗ | return err; | |
| 68 | } | ||
| 69 | |||
| 70 | ✗ | pkt->stream_index = st->index; | |
| 71 | ✗ | memcpy(pkt->data, buf, len); | |
| 72 | ✗ | return 0; | |
| 73 | |||
| 74 | ✗ | case 1: | |
| 75 | case 2: /* First fragment */ | ||
| 76 | ✗ | ffio_free_dyn_buf(&data->fragment); | |
| 77 | |||
| 78 | ✗ | data->last_frame = 1; | |
| 79 | ✗ | data->nr_frames = nr_frames; | |
| 80 | ✗ | err = avio_open_dyn_buf(&data->fragment); | |
| 81 | ✗ | if (err < 0) | |
| 82 | ✗ | return err; | |
| 83 | |||
| 84 | ✗ | avio_write(data->fragment, buf, len); | |
| 85 | ✗ | data->timestamp = *timestamp; | |
| 86 | ✗ | return AVERROR(EAGAIN); | |
| 87 | |||
| 88 | ✗ | case 3: /* Fragment other than first */ | |
| 89 | ✗ | if (!data->fragment) { | |
| 90 | ✗ | av_log(ctx, AV_LOG_WARNING, | |
| 91 | "Received packet without a start fragment; dropping.\n"); | ||
| 92 | ✗ | return AVERROR(EAGAIN); | |
| 93 | } | ||
| 94 | ✗ | if (nr_frames != data->nr_frames || | |
| 95 | ✗ | data->timestamp != *timestamp) { | |
| 96 | ✗ | ffio_free_dyn_buf(&data->fragment); | |
| 97 | ✗ | av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n"); | |
| 98 | ✗ | return AVERROR_INVALIDDATA; | |
| 99 | } | ||
| 100 | |||
| 101 | ✗ | avio_write(data->fragment, buf, len); | |
| 102 | ✗ | data->last_frame++; | |
| 103 | } | ||
| 104 | |||
| 105 | ✗ | if (!(flags & RTP_FLAG_MARKER)) | |
| 106 | ✗ | return AVERROR(EAGAIN); | |
| 107 | |||
| 108 | ✗ | if (data->last_frame != data->nr_frames) { | |
| 109 | ✗ | ffio_free_dyn_buf(&data->fragment); | |
| 110 | ✗ | av_log(ctx, AV_LOG_ERROR, "Missed %d packets\n", | |
| 111 | ✗ | data->nr_frames - data->last_frame); | |
| 112 | ✗ | return AVERROR_INVALIDDATA; | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | err = ff_rtp_finalize_packet(pkt, &data->fragment, st->index); | |
| 116 | ✗ | if (err < 0) { | |
| 117 | ✗ | av_log(ctx, AV_LOG_ERROR, | |
| 118 | "Error occurred when getting fragment buffer.\n"); | ||
| 119 | ✗ | return err; | |
| 120 | } | ||
| 121 | |||
| 122 | ✗ | return 0; | |
| 123 | } | ||
| 124 | |||
| 125 | const RTPDynamicProtocolHandler ff_ac3_dynamic_handler = { | ||
| 126 | .enc_name = "ac3", | ||
| 127 | .codec_type = AVMEDIA_TYPE_AUDIO, | ||
| 128 | .codec_id = AV_CODEC_ID_AC3, | ||
| 129 | .need_parsing = AVSTREAM_PARSE_FULL, | ||
| 130 | .priv_data_size = sizeof(PayloadContext), | ||
| 131 | .close = ac3_close_context, | ||
| 132 | .parse_packet = ac3_handle_packet, | ||
| 133 | }; | ||
| 134 |