mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Martin Storsjö <martin@martin.st>pull/113/head^2
Gilles Chanteperdrix
10 years ago
committed by
Martin Storsjö
parent
5cbae5651d
commit
96084251e5
6 changed files with 229 additions and 1 deletions
@ -0,0 +1,224 @@ |
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/*
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* RTP parser for loss tolerant payload format for MP3 audio (RFC 5219) |
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* Copyright (c) 2015 Gilles Chanteperdrix <gch@xenomai.org> |
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* |
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* This file is part of Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#include "libavutil/attributes.h" |
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#include "libavutil/intreadwrite.h" |
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#include "rtpdec_formats.h" |
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struct PayloadContext { |
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unsigned adu_size; |
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unsigned cur_size; |
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uint32_t timestamp; |
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uint8_t *split_buf; |
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int split_pos, split_buf_size, split_pkts; |
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AVIOContext *fragment; |
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}; |
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static av_cold int mpa_robust_init(AVFormatContext *ctx, int st_index, |
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PayloadContext *data) |
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{ |
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if (st_index < 0) |
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return 0; |
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ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_HEADERS; |
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return 0; |
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} |
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static PayloadContext *mpa_robust_new_context(void) |
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{ |
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return av_mallocz(sizeof(PayloadContext)); |
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} |
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static inline void free_fragment(PayloadContext *data) |
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{ |
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if (data->fragment) { |
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uint8_t *p; |
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avio_close_dyn_buf(data->fragment, &p); |
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av_free(p); |
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data->fragment = NULL; |
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} |
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} |
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static void mpa_robust_free_context(PayloadContext *data) |
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{ |
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free_fragment(data); |
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av_free(data->split_buf); |
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av_free(data); |
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} |
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static int mpa_robust_parse_rtp_header(AVFormatContext *ctx, |
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const uint8_t *buf, int len, |
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unsigned *adu_size, unsigned *cont) |
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{ |
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unsigned header_size; |
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if (len < 2) { |
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av_log(ctx, AV_LOG_ERROR, "Invalid %d bytes packet\n", len); |
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return AVERROR_INVALIDDATA; |
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} |
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*cont = !!(buf[0] & 0x80); |
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if (!(buf[0] & 0x40)) { |
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header_size = 1; |
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*adu_size = buf[0] & ~0xc0; |
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} else { |
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header_size = 2; |
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*adu_size = AV_RB16(buf) & ~0xc000; |
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} |
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return header_size; |
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} |
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static int mpa_robust_parse_packet(AVFormatContext *ctx, PayloadContext *data, |
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AVStream *st, AVPacket *pkt, |
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uint32_t *timestamp, const uint8_t *buf, |
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int len, uint16_t seq, int flags) |
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{ |
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unsigned adu_size, continuation; |
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int err, header_size; |
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if (!buf) { |
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buf = &data->split_buf[data->split_pos]; |
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len = data->split_buf_size - data->split_pos; |
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header_size = mpa_robust_parse_rtp_header(ctx, buf, len, &adu_size, |
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&continuation); |
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if (header_size < 0) { |
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av_freep(&data->split_buf); |
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return header_size; |
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} |
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buf += header_size; |
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len -= header_size; |
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if (continuation || adu_size > len) { |
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av_freep(&data->split_buf); |
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av_log(ctx, AV_LOG_ERROR, "Invalid frame\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (av_new_packet(pkt, adu_size)) { |
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av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); |
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return AVERROR(ENOMEM); |
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} |
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pkt->stream_index = st->index; |
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memcpy(pkt->data, buf, adu_size); |
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data->split_pos += adu_size; |
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if (data->split_pos == data->split_buf_size) { |
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av_freep(&data->split_buf); |
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return 0; |
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} |
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return 1; |
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} |
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header_size = mpa_robust_parse_rtp_header(ctx, buf, len, &adu_size, |
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&continuation); |
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if (header_size < 0) |
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return header_size; |
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buf += header_size; |
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len -= header_size; |
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if (!continuation && adu_size <= len) { |
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/* One or more complete frames */ |
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if (av_new_packet(pkt, adu_size)) { |
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av_log(ctx, AV_LOG_ERROR, "Out of memory.\n"); |
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return AVERROR(ENOMEM); |
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} |
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pkt->stream_index = st->index; |
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memcpy(pkt->data, buf, adu_size); |
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buf += adu_size; |
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len -= adu_size; |
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if (len) { |
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data->split_buf_size = len; |
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data->split_buf = av_malloc(data->split_buf_size); |
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data->split_pos = 0; |
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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_free_packet(pkt); |
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return AVERROR(ENOMEM); |
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} |
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memcpy(data->split_buf, buf, data->split_buf_size); |
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return 1; |
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} |
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return 0; |
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} else if (!continuation) { /* && adu_size > len */ |
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/* First fragment */ |
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free_fragment(data); |
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data->adu_size = adu_size; |
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data->cur_size = len; |
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data->timestamp = *timestamp; |
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err = avio_open_dyn_buf(&data->fragment); |
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if (err < 0) |
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return err; |
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avio_write(data->fragment, buf, len); |
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return AVERROR(EAGAIN); |
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} |
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/* else continuation == 1 */ |
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/* Fragment other than first */ |
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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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if (adu_size = data->adu_size || |
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data->timestamp != *timestamp) { |
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free_fragment(data); |
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av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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avio_write(data->fragment, buf, len); |
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data->cur_size += len; |
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if (data->cur_size < data->adu_size) |
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return AVERROR(EAGAIN); |
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err = ff_rtp_finalize_packet(pkt, &data->fragment, st->index); |
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if (err < 0) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Error occurred when getting fragment buffer.\n"); |
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return err; |
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} |
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return 0; |
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} |
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RTPDynamicProtocolHandler ff_mpeg_audio_robust_dynamic_handler = { |
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.codec_type = AVMEDIA_TYPE_AUDIO, |
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.codec_id = AV_CODEC_ID_MP3ADU, |
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.init = mpa_robust_init, |
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.alloc = mpa_robust_new_context, |
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.free = mpa_robust_free_context, |
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.parse_packet = mpa_robust_parse_packet, |
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.enc_name = "mpa-robust", |
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}; |
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