389 lines
13 KiB
C
389 lines
13 KiB
C
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/*
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* Xiph RTP Protocols
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* Copyright (c) 2009 Colin McQuillian
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* Copyright (c) 2010 Josh Allmann
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief Xiph / RTP Code
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* @author Colin McQuillan <m.niloc@gmail.com>
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* @author Josh Allmann <joshua.allmann@gmail.com>
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "libavcodec/bytestream.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "rtpdec.h"
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#include "rtpdec_formats.h"
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/**
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* RTP/Xiph specific private data.
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*/
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struct PayloadContext {
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unsigned ident; ///< 24-bit stream configuration identifier
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uint32_t timestamp;
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AVIOContext* fragment; ///< buffer for split payloads
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uint8_t *split_buf;
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int split_pos, split_buf_len, split_buf_size;
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int split_pkts;
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};
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static void xiph_close_context(PayloadContext * data)
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{
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ffio_free_dyn_buf(&data->fragment);
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av_freep(&data->split_buf);
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}
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static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq,
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int flags)
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{
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int ident, fragmented, tdt, num_pkts, pkt_len, ret;
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if (!buf) {
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if (!data->split_buf || data->split_pos + 2 > data->split_buf_len ||
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data->split_pkts <= 0) {
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av_log(ctx, AV_LOG_ERROR, "No more data to return\n");
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return AVERROR_INVALIDDATA;
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}
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pkt_len = AV_RB16(data->split_buf + data->split_pos);
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data->split_pos += 2;
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if (pkt_len > data->split_buf_len - data->split_pos) {
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av_log(ctx, AV_LOG_ERROR, "Not enough data to return\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = av_new_packet(pkt, pkt_len)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
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return ret;
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}
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pkt->stream_index = st->index;
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memcpy(pkt->data, data->split_buf + data->split_pos, pkt_len);
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data->split_pos += pkt_len;
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data->split_pkts--;
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return data->split_pkts > 0;
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}
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if (len < 6 || len > INT_MAX/2) {
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av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
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return AVERROR_INVALIDDATA;
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}
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// read xiph rtp headers
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ident = AV_RB24(buf);
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fragmented = buf[3] >> 6;
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tdt = (buf[3] >> 4) & 3;
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num_pkts = buf[3] & 0xf;
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pkt_len = AV_RB16(buf + 4);
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if (pkt_len > len - 6) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid packet length %d in %d byte packet\n", pkt_len,
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len);
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return AVERROR_INVALIDDATA;
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}
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if (ident != data->ident) {
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avpriv_report_missing_feature(ctx, "Xiph SDP configuration change");
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return AVERROR_PATCHWELCOME;
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}
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if (tdt) {
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avpriv_report_missing_feature(ctx,
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"RTP Xiph packet settings (%d,%d,%d)",
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fragmented, tdt, num_pkts);
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return AVERROR_PATCHWELCOME;
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}
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buf += 6; // move past header bits
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len -= 6;
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if (fragmented == 0) {
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if ((ret = av_new_packet(pkt, pkt_len)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
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return ret;
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}
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pkt->stream_index = st->index;
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memcpy(pkt->data, buf, pkt_len);
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buf += pkt_len;
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len -= pkt_len;
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num_pkts--;
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if (num_pkts > 0) {
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if (len > data->split_buf_size || !data->split_buf) {
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av_freep(&data->split_buf);
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data->split_buf_size = 2 * len;
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data->split_buf = av_malloc(data->split_buf_size);
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if (!data->split_buf) {
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av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
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av_packet_unref(pkt);
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return AVERROR(ENOMEM);
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}
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}
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memcpy(data->split_buf, buf, len);
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data->split_buf_len = len;
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data->split_pos = 0;
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data->split_pkts = num_pkts;
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return 1;
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}
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return 0;
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} else if (fragmented == 1) {
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// start of xiph data fragment
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int res;
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// end packet has been lost somewhere, so drop buffered data
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ffio_free_dyn_buf(&data->fragment);
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if((res = avio_open_dyn_buf(&data->fragment)) < 0)
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return res;
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avio_write(data->fragment, buf, pkt_len);
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data->timestamp = *timestamp;
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} else {
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av_assert1(fragmented < 4);
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if (data->timestamp != *timestamp) {
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// skip if fragmented timestamp is incorrect;
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// a start packet has been lost somewhere
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ffio_free_dyn_buf(&data->fragment);
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av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
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return AVERROR_INVALIDDATA;
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}
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if (!data->fragment) {
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av_log(ctx, AV_LOG_WARNING,
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"Received packet without a start fragment; dropping.\n");
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return AVERROR(EAGAIN);
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}
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// copy data to fragment buffer
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avio_write(data->fragment, buf, pkt_len);
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if (fragmented == 3) {
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// end of xiph data packet
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int ret = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Error occurred when getting fragment buffer.");
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return ret;
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}
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return 0;
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}
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}
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return AVERROR(EAGAIN);
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}
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/**
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* Length encoding described in RFC5215 section 3.1.1.
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*/
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static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
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{
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int n = 0;
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for (; *buf < buf_end; ++*buf) {
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n <<= 7;
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n += **buf & 0x7f;
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if (!(**buf & 0x80)) {
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++*buf;
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return n;
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}
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}
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return 0;
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}
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/**
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* Based off parse_packed_headers in Vorbis RTP
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*/
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static int
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parse_packed_headers(AVFormatContext *s,
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const uint8_t * packed_headers,
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const uint8_t * packed_headers_end,
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AVCodecParameters *par, PayloadContext * xiph_data)
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{
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unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
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int ret;
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uint8_t *ptr;
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if (packed_headers_end - packed_headers < 9) {
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av_log(s, AV_LOG_ERROR,
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"Invalid %"PTRDIFF_SPECIFIER" byte packed header.",
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packed_headers_end - packed_headers);
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return AVERROR_INVALIDDATA;
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}
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num_packed = bytestream_get_be32(&packed_headers);
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xiph_data->ident = bytestream_get_be24(&packed_headers);
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length = bytestream_get_be16(&packed_headers);
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num_headers = get_base128(&packed_headers, packed_headers_end);
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length1 = get_base128(&packed_headers, packed_headers_end);
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length2 = get_base128(&packed_headers, packed_headers_end);
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if (num_packed != 1 || num_headers > 3) {
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avpriv_report_missing_feature(s, "%u packed headers, %u headers",
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num_packed, num_headers);
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return AVERROR_PATCHWELCOME;
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}
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if (packed_headers_end - packed_headers != length ||
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length1 > length || length2 > length - length1) {
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av_log(s, AV_LOG_ERROR,
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"Bad packed header lengths (%d,%d,%"PTRDIFF_SPECIFIER",%u)\n", length1,
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length2, packed_headers_end - packed_headers, length);
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return AVERROR_INVALIDDATA;
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}
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/* allocate extra space:
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* -- length/255 +2 for xiphlacing
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* -- one for the '2' marker
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* -- AV_INPUT_BUFFER_PADDING_SIZE required */
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extradata_alloc = length + length/255 + 3 + AV_INPUT_BUFFER_PADDING_SIZE;
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if ((ret = ff_alloc_extradata(par, extradata_alloc)) < 0) {
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av_log(s, AV_LOG_ERROR, "Out of memory\n");
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return ret;
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}
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ptr = par->extradata;
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*ptr++ = 2;
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ptr += av_xiphlacing(ptr, length1);
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ptr += av_xiphlacing(ptr, length2);
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memcpy(ptr, packed_headers, length);
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ptr += length;
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par->extradata_size = ptr - par->extradata;
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// clear out remaining parts of the buffer
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memset(ptr, 0, extradata_alloc - par->extradata_size);
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return 0;
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}
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static int xiph_parse_fmtp_pair(AVFormatContext *s,
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AVStream* stream,
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PayloadContext *xiph_data,
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const char *attr, const char *value)
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{
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AVCodecParameters *par = stream->codecpar;
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int result = 0;
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if (!strcmp(attr, "sampling")) {
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if (!strcmp(value, "YCbCr-4:2:0")) {
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par->format = AV_PIX_FMT_YUV420P;
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} else if (!strcmp(value, "YCbCr-4:4:2")) {
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par->format = AV_PIX_FMT_YUV422P;
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} else if (!strcmp(value, "YCbCr-4:4:4")) {
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par->format = AV_PIX_FMT_YUV444P;
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} else {
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av_log(s, AV_LOG_ERROR,
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"Unsupported pixel format %s\n", attr);
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return AVERROR_INVALIDDATA;
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}
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} else if (!strcmp(attr, "width")) {
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/* This is an integer between 1 and 1048561
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* and MUST be in multiples of 16. */
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par->width = atoi(value);
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return 0;
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} else if (!strcmp(attr, "height")) {
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/* This is an integer between 1 and 1048561
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* and MUST be in multiples of 16. */
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par->height = atoi(value);
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return 0;
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} else if (!strcmp(attr, "delivery-method")) {
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/* Possible values are: inline, in_band, out_band/specific_name. */
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return AVERROR_PATCHWELCOME;
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} else if (!strcmp(attr, "configuration-uri")) {
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/* NOTE: configuration-uri is supported only under 2 conditions:
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*--after the delivery-method tag
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* --with a delivery-method value of out_band */
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return AVERROR_PATCHWELCOME;
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} else if (!strcmp(attr, "configuration")) {
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/* NOTE: configuration is supported only AFTER the delivery-method tag
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* The configuration value is a base64 encoded packed header */
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uint8_t *decoded_packet = NULL;
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int packet_size;
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size_t decoded_alloc = strlen(value) / 4 * 3 + 4;
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if (decoded_alloc <= INT_MAX) {
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decoded_packet = av_malloc(decoded_alloc);
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if (decoded_packet) {
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packet_size =
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av_base64_decode(decoded_packet, value, decoded_alloc);
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result = parse_packed_headers
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(s, decoded_packet, decoded_packet + packet_size, par,
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xiph_data);
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} else {
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av_log(s, AV_LOG_ERROR,
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"Out of memory while decoding SDP configuration.\n");
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result = AVERROR(ENOMEM);
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}
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} else {
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av_log(s, AV_LOG_ERROR, "Packet too large\n");
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result = AVERROR_INVALIDDATA;
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}
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av_free(decoded_packet);
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}
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return result;
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}
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static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
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PayloadContext *data, const char *line)
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{
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const char *p;
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if (st_index < 0)
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return 0;
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if (av_strstart(line, "fmtp:", &p)) {
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return ff_parse_fmtp(s, s->streams[st_index], data, p,
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xiph_parse_fmtp_pair);
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}
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||
|
|
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,
|
||
|
|
};
|