220 lines
7.5 KiB
C
220 lines
7.5 KiB
C
/*
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* RTP Depacketization of QCELP/PureVoice, RFC 2658
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* Copyright (c) 2010 Martin Storsjo
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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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#include "rtpdec_formats.h"
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static const uint8_t frame_sizes[] = {
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1, 4, 8, 17, 35
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};
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typedef struct InterleavePacket {
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int pos;
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int size;
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/* The largest frame is 35 bytes, only 10 frames are allowed per
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* packet, and we return the first one immediately, so allocate
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* space for 9 frames */
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uint8_t data[35*9];
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} InterleavePacket;
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struct PayloadContext {
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int interleave_size;
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int interleave_index;
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InterleavePacket group[6];
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int group_finished;
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/* The maximum packet size, 10 frames of 35 bytes each, and one
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* packet header byte. */
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uint8_t next_data[1 + 35*10];
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int next_size;
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uint32_t next_timestamp;
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};
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static int return_stored_frame(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);
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static int store_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)
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{
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int interleave_size, interleave_index;
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int frame_size, ret;
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InterleavePacket* ip;
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if (len < 2)
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return AVERROR_INVALIDDATA;
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interleave_size = buf[0] >> 3 & 7;
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interleave_index = buf[0] & 7;
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if (interleave_size > 5) {
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av_log(ctx, AV_LOG_ERROR, "Invalid interleave size %d\n",
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interleave_size);
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return AVERROR_INVALIDDATA;
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}
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if (interleave_index > interleave_size) {
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av_log(ctx, AV_LOG_ERROR, "Invalid interleave index %d/%d\n",
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interleave_index, interleave_size);
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return AVERROR_INVALIDDATA;
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}
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if (interleave_size != data->interleave_size) {
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int i;
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/* First packet, or changed interleave size */
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data->interleave_size = interleave_size;
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data->interleave_index = 0;
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for (i = 0; i < 6; i++)
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data->group[i].size = 0;
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}
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if (interleave_index < data->interleave_index) {
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/* Wrapped around - missed the last packet of the previous group. */
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if (data->group_finished) {
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/* No more data in the packets in this interleaving group, just
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* start processing the next one */
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data->interleave_index = 0;
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} else {
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/* Stash away the current packet, emit everything we have of the
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* previous group. */
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for (; data->interleave_index <= interleave_size;
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data->interleave_index++)
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data->group[data->interleave_index].size = 0;
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if (len > sizeof(data->next_data))
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return AVERROR_INVALIDDATA;
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memcpy(data->next_data, buf, len);
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data->next_size = len;
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data->next_timestamp = *timestamp;
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*timestamp = RTP_NOTS_VALUE;
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data->interleave_index = 0;
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return return_stored_frame(ctx, data, st, pkt, timestamp, buf, len);
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}
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}
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if (interleave_index > data->interleave_index) {
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/* We missed a packet */
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for (; data->interleave_index < interleave_index;
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data->interleave_index++)
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data->group[data->interleave_index].size = 0;
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}
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data->interleave_index = interleave_index;
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if (buf[1] >= FF_ARRAY_ELEMS(frame_sizes))
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return AVERROR_INVALIDDATA;
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frame_size = frame_sizes[buf[1]];
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if (1 + frame_size > len)
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return AVERROR_INVALIDDATA;
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if (len - 1 - frame_size > sizeof(data->group[0].data))
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return AVERROR_INVALIDDATA;
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if ((ret = av_new_packet(pkt, frame_size)) < 0)
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return ret;
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memcpy(pkt->data, &buf[1], frame_size);
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pkt->stream_index = st->index;
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ip = &data->group[data->interleave_index];
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ip->size = len - 1 - frame_size;
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ip->pos = 0;
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memcpy(ip->data, &buf[1 + frame_size], ip->size);
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/* Each packet must contain the same number of frames according to the
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* RFC. If there's no data left in this packet, there shouldn't be any
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* in any of the other frames in the interleaving group either. */
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data->group_finished = ip->size == 0;
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if (interleave_index == interleave_size) {
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data->interleave_index = 0;
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return !data->group_finished;
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} else {
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data->interleave_index++;
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return 0;
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}
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}
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static int return_stored_frame(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)
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{
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InterleavePacket* ip = &data->group[data->interleave_index];
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int frame_size, ret;
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if (data->group_finished && data->interleave_index == 0) {
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*timestamp = data->next_timestamp;
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ret = store_packet(ctx, data, st, pkt, timestamp, data->next_data,
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data->next_size);
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data->next_size = 0;
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return ret;
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}
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if (ip->size == 0) {
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/* No stored data for this interleave block, output an empty packet */
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if ((ret = av_new_packet(pkt, 1)) < 0)
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return ret;
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pkt->data[0] = 0; // Blank - could also be 14, Erasure
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} else {
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if (ip->pos >= ip->size)
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return AVERROR_INVALIDDATA;
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if (ip->data[ip->pos] >= FF_ARRAY_ELEMS(frame_sizes))
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return AVERROR_INVALIDDATA;
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frame_size = frame_sizes[ip->data[ip->pos]];
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if (ip->pos + frame_size > ip->size)
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return AVERROR_INVALIDDATA;
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if ((ret = av_new_packet(pkt, frame_size)) < 0)
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return ret;
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memcpy(pkt->data, &ip->data[ip->pos], frame_size);
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ip->pos += frame_size;
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data->group_finished = ip->pos >= ip->size;
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}
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pkt->stream_index = st->index;
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if (data->interleave_index == data->interleave_size) {
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data->interleave_index = 0;
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if (!data->group_finished)
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return 1;
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else
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return data->next_size > 0;
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} else {
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data->interleave_index++;
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return 1;
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}
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}
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static int qcelp_parse_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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if (buf)
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return store_packet(ctx, data, st, pkt, timestamp, buf, len);
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else
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return return_stored_frame(ctx, data, st, pkt, timestamp, buf, len);
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}
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const RTPDynamicProtocolHandler ff_qcelp_dynamic_handler = {
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.enc_name = "x-Purevoice",
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.codec_type = AVMEDIA_TYPE_AUDIO,
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.codec_id = AV_CODEC_ID_QCELP,
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.priv_data_size = sizeof(PayloadContext),
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.static_payload_id = 12,
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.parse_packet = qcelp_parse_packet,
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};
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