| /* | |
| * Xiph RTP Protocols | |
| * Copyright (c) 2009 Colin McQuillian | |
| * Copyright (c) 2010 Josh Allmann | |
| * | |
| * 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 | |
| */ | |
| /** | |
| * @file | |
| * @brief Xiph / RTP Code | |
| * @author Colin McQuillan <m.niloc@gmail.com> | |
| * @author Josh Allmann <joshua.allmann@gmail.com> | |
| */ | |
| #include "libavutil/attributes.h" | |
| #include "libavutil/avassert.h" | |
| #include "libavutil/avstring.h" | |
| #include "libavutil/base64.h" | |
| #include "libavcodec/bytestream.h" | |
| #include "avio_internal.h" | |
| #include "internal.h" | |
| #include "rtpdec.h" | |
| #include "rtpdec_formats.h" | |
| /** | |
| * RTP/Xiph specific private data. | |
| */ | |
| struct PayloadContext { | |
| unsigned ident; ///< 24-bit stream configuration identifier | |
| uint32_t timestamp; | |
| AVIOContext* fragment; ///< buffer for split payloads | |
| uint8_t *split_buf; | |
| int split_pos, split_buf_len, split_buf_size; | |
| int split_pkts; | |
| }; | |
| static void xiph_close_context(PayloadContext * data) | |
| { | |
| ffio_free_dyn_buf(&data->fragment); | |
| av_freep(&data->split_buf); | |
| } | |
| static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data, | |
| AVStream *st, AVPacket *pkt, uint32_t *timestamp, | |
| const uint8_t *buf, int len, uint16_t seq, | |
| int flags) | |
| { | |
| int ident, fragmented, tdt, num_pkts, pkt_len, ret; | |
| if (!buf) { | |
| if (!data->split_buf || data->split_pos + 2 > data->split_buf_len || | |
| data->split_pkts <= 0) { | |
| av_log(ctx, AV_LOG_ERROR, "No more data to return\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| pkt_len = AV_RB16(data->split_buf + data->split_pos); | |
| data->split_pos += 2; | |
| if (pkt_len > data->split_buf_len - data->split_pos) { | |
| av_log(ctx, AV_LOG_ERROR, "Not enough data to return\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if ((ret = av_new_packet(pkt, pkt_len)) < 0) { | |
| av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); | |
| return ret; | |
| } | |
| pkt->stream_index = st->index; | |
| memcpy(pkt->data, data->split_buf + data->split_pos, pkt_len); | |
| data->split_pos += pkt_len; | |
| data->split_pkts--; | |
| return data->split_pkts > 0; | |
| } | |
| if (len < 6 || len > INT_MAX/2) { | |
| av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| // read xiph rtp headers | |
| ident = AV_RB24(buf); | |
| fragmented = buf[3] >> 6; | |
| tdt = (buf[3] >> 4) & 3; | |
| num_pkts = buf[3] & 0xf; | |
| pkt_len = AV_RB16(buf + 4); | |
| if (pkt_len > len - 6) { | |
| av_log(ctx, AV_LOG_ERROR, | |
| "Invalid packet length %d in %d byte packet\n", pkt_len, | |
| len); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (ident != data->ident) { | |
| avpriv_report_missing_feature(ctx, "Xiph SDP configuration change"); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| if (tdt) { | |
| avpriv_report_missing_feature(ctx, | |
| "RTP Xiph packet settings (%d,%d,%d)", | |
| fragmented, tdt, num_pkts); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| buf += 6; // move past header bits | |
| len -= 6; | |
| if (fragmented == 0) { | |
| if ((ret = av_new_packet(pkt, pkt_len)) < 0) { | |
| av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); | |
| return ret; | |
| } | |
| pkt->stream_index = st->index; | |
| memcpy(pkt->data, buf, pkt_len); | |
| buf += pkt_len; | |
| len -= pkt_len; | |
| num_pkts--; | |
| if (num_pkts > 0) { | |
| if (len > data->split_buf_size || !data->split_buf) { | |
| av_freep(&data->split_buf); | |
| data->split_buf_size = 2 * len; | |
| data->split_buf = av_malloc(data->split_buf_size); | |
| if (!data->split_buf) { | |
| av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); | |
| av_packet_unref(pkt); | |
| return AVERROR(ENOMEM); | |
| } | |
| } | |
| memcpy(data->split_buf, buf, len); | |
| data->split_buf_len = len; | |
| data->split_pos = 0; | |
| data->split_pkts = num_pkts; | |
| return 1; | |
| } | |
| return 0; | |
| } else if (fragmented == 1) { | |
| // start of xiph data fragment | |
| int res; | |
| // end packet has been lost somewhere, so drop buffered data | |
| ffio_free_dyn_buf(&data->fragment); | |
| if((res = avio_open_dyn_buf(&data->fragment)) < 0) | |
| return res; | |
| avio_write(data->fragment, buf, pkt_len); | |
| data->timestamp = *timestamp; | |
| } else { | |
| av_assert1(fragmented < 4); | |
| if (data->timestamp != *timestamp) { | |
| // skip if fragmented timestamp is incorrect; | |
| // a start packet has been lost somewhere | |
| ffio_free_dyn_buf(&data->fragment); | |
| av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (!data->fragment) { | |
| av_log(ctx, AV_LOG_WARNING, | |
| "Received packet without a start fragment; dropping.\n"); | |
| return AVERROR(EAGAIN); | |
| } | |
| // copy data to fragment buffer | |
| avio_write(data->fragment, buf, pkt_len); | |
| if (fragmented == 3) { | |
| // end of xiph data packet | |
| int ret = ff_rtp_finalize_packet(pkt, &data->fragment, st->index); | |
| if (ret < 0) { | |
| av_log(ctx, AV_LOG_ERROR, | |
| "Error occurred when getting fragment buffer."); | |
| return ret; | |
| } | |
| return 0; | |
| } | |
| } | |
| return AVERROR(EAGAIN); | |
| } | |
| /** | |
| * Length encoding described in RFC5215 section 3.1.1. | |
| */ | |
| static int get_base128(const uint8_t ** buf, const uint8_t * buf_end) | |
| { | |
| int n = 0; | |
| for (; *buf < buf_end; ++*buf) { | |
| n <<= 7; | |
| n += **buf & 0x7f; | |
| if (!(**buf & 0x80)) { | |
| ++*buf; | |
| return n; | |
| } | |
| } | |
| return 0; | |
| } | |
| /** | |
| * Based off parse_packed_headers in Vorbis RTP | |
| */ | |
| static int | |
| parse_packed_headers(AVFormatContext *s, | |
| const uint8_t * packed_headers, | |
| const uint8_t * packed_headers_end, | |
| AVCodecParameters *par, PayloadContext * xiph_data) | |
| { | |
| unsigned num_packed, num_headers, length, length1, length2, extradata_alloc; | |
| int ret; | |
| uint8_t *ptr; | |
| if (packed_headers_end - packed_headers < 9) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid %"PTRDIFF_SPECIFIER" byte packed header.", | |
| packed_headers_end - packed_headers); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| num_packed = bytestream_get_be32(&packed_headers); | |
| xiph_data->ident = bytestream_get_be24(&packed_headers); | |
| length = bytestream_get_be16(&packed_headers); | |
| num_headers = get_base128(&packed_headers, packed_headers_end); | |
| length1 = get_base128(&packed_headers, packed_headers_end); | |
| length2 = get_base128(&packed_headers, packed_headers_end); | |
| if (num_packed != 1 || num_headers > 3) { | |
| avpriv_report_missing_feature(s, "%u packed headers, %u headers", | |
| num_packed, num_headers); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| if (packed_headers_end - packed_headers != length || | |
| length1 > length || length2 > length - length1) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Bad packed header lengths (%d,%d,%"PTRDIFF_SPECIFIER",%u)\n", length1, | |
| length2, packed_headers_end - packed_headers, length); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| /* allocate extra space: | |
| * -- length/255 +2 for xiphlacing | |
| * -- one for the '2' marker | |
| * -- AV_INPUT_BUFFER_PADDING_SIZE required */ | |
| extradata_alloc = length + length/255 + 3 + AV_INPUT_BUFFER_PADDING_SIZE; | |
| if ((ret = ff_alloc_extradata(par, extradata_alloc)) < 0) { | |
| av_log(s, AV_LOG_ERROR, "Out of memory\n"); | |
| return ret; | |
| } | |
| ptr = par->extradata; | |
| *ptr++ = 2; | |
| ptr += av_xiphlacing(ptr, length1); | |
| ptr += av_xiphlacing(ptr, length2); | |
| memcpy(ptr, packed_headers, length); | |
| ptr += length; | |
| par->extradata_size = ptr - par->extradata; | |
| // clear out remaining parts of the buffer | |
| memset(ptr, 0, extradata_alloc - par->extradata_size); | |
| return 0; | |
| } | |
| static int xiph_parse_fmtp_pair(AVFormatContext *s, | |
| AVStream* stream, | |
| PayloadContext *xiph_data, | |
| const char *attr, const char *value) | |
| { | |
| AVCodecParameters *par = stream->codecpar; | |
| int result = 0; | |
| if (!strcmp(attr, "sampling")) { | |
| if (!strcmp(value, "YCbCr-4:2:0")) { | |
| par->format = AV_PIX_FMT_YUV420P; | |
| } else if (!strcmp(value, "YCbCr-4:4:2")) { | |
| par->format = AV_PIX_FMT_YUV422P; | |
| } else if (!strcmp(value, "YCbCr-4:4:4")) { | |
| par->format = AV_PIX_FMT_YUV444P; | |
| } else { | |
| av_log(s, AV_LOG_ERROR, | |
| "Unsupported pixel format %s\n", attr); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } else if (!strcmp(attr, "width")) { | |
| /* This is an integer between 1 and 1048561 | |
| * and MUST be in multiples of 16. */ | |
| par->width = atoi(value); | |
| return 0; | |
| } else if (!strcmp(attr, "height")) { | |
| /* This is an integer between 1 and 1048561 | |
| * and MUST be in multiples of 16. */ | |
| par->height = atoi(value); | |
| return 0; | |
| } else if (!strcmp(attr, "delivery-method")) { | |
| /* Possible values are: inline, in_band, out_band/specific_name. */ | |
| return AVERROR_PATCHWELCOME; | |
| } else if (!strcmp(attr, "configuration-uri")) { | |
| /* NOTE: configuration-uri is supported only under 2 conditions: | |
| *--after the delivery-method tag | |
| * --with a delivery-method value of out_band */ | |
| return AVERROR_PATCHWELCOME; | |
| } else if (!strcmp(attr, "configuration")) { | |
| /* NOTE: configuration is supported only AFTER the delivery-method tag | |
| * The configuration value is a base64 encoded packed header */ | |
| uint8_t *decoded_packet = NULL; | |
| int packet_size; | |
| size_t decoded_alloc = strlen(value) / 4 * 3 + 4; | |
| if (decoded_alloc <= INT_MAX) { | |
| decoded_packet = av_malloc(decoded_alloc); | |
| if (decoded_packet) { | |
| packet_size = | |
| av_base64_decode(decoded_packet, value, decoded_alloc); | |
| result = parse_packed_headers | |
| (s, decoded_packet, decoded_packet + packet_size, par, | |
| xiph_data); | |
| } else { | |
| av_log(s, AV_LOG_ERROR, | |
| "Out of memory while decoding SDP configuration.\n"); | |
| result = AVERROR(ENOMEM); | |
| } | |
| } else { | |
| av_log(s, AV_LOG_ERROR, "Packet too large\n"); | |
| result = AVERROR_INVALIDDATA; | |
| } | |
| av_free(decoded_packet); | |
| } | |
| return result; | |
| } | |
| static int xiph_parse_sdp_line(AVFormatContext *s, int st_index, | |
| PayloadContext *data, const char *line) | |
| { | |
| const char *p; | |
| if (st_index < 0) | |
| return 0; | |
| if (av_strstart(line, "fmtp:", &p)) { | |
| return ff_parse_fmtp(s, s->streams[st_index], data, p, | |
| xiph_parse_fmtp_pair); | |
| } | |
| return 0; | |
| } | |
| const RTPDynamicProtocolHandler ff_theora_dynamic_handler = { | |
| .enc_name = "theora", | |
| .codec_type = AVMEDIA_TYPE_VIDEO, | |
| .codec_id = AV_CODEC_ID_THEORA, | |
| .priv_data_size = sizeof(PayloadContext), | |
| .parse_sdp_a_line = xiph_parse_sdp_line, | |
| .close = xiph_close_context, | |
| .parse_packet = xiph_handle_packet, | |
| }; | |
| const RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = { | |
| .enc_name = "vorbis", | |
| .codec_type = AVMEDIA_TYPE_AUDIO, | |
| .codec_id = AV_CODEC_ID_VORBIS, | |
| .need_parsing = AVSTREAM_PARSE_HEADERS, | |
| .priv_data_size = sizeof(PayloadContext), | |
| .parse_sdp_a_line = xiph_parse_sdp_line, | |
| .close = xiph_close_context, | |
| .parse_packet = xiph_handle_packet, | |
| }; |