2014-04-17 10:51:03 +00:00
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/*
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* Copyright (c) 2013-2014 Mozilla Corporation
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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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/**
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* @file
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* Opus parser
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*
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* Determines the duration for each packet.
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*/
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#include "avcodec.h"
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2014-10-17 23:25:16 +00:00
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#include "bytestream.h"
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2014-04-17 10:51:03 +00:00
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#include "opus.h"
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2014-10-17 23:25:16 +00:00
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#include "parser.h"
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2014-04-17 10:51:03 +00:00
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typedef struct OpusParseContext {
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OpusContext ctx;
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OpusPacket pkt;
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int extradata_parsed;
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2014-10-17 23:25:16 +00:00
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ParseContext pc;
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int ts_framing;
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2014-04-17 10:51:03 +00:00
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} OpusParseContext;
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2014-10-17 23:25:16 +00:00
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static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len)
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{
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const uint8_t *buf = start + 1;
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int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length, i;
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uint8_t flags;
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GetByteContext gb;
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bytestream2_init(&gb, buf, buf_len);
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flags = bytestream2_get_byte(&gb);
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start_trim_flag = (flags >> 4) & 1;
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end_trim_flag = (flags >> 3) & 1;
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control_extension_flag = (flags >> 2) & 1;
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*payload_len = 0;
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while (bytestream2_peek_byte(&gb) == 0xff)
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*payload_len += bytestream2_get_byte(&gb);
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*payload_len += bytestream2_get_byte(&gb);
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if (start_trim_flag)
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bytestream2_skip(&gb, 2);
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if (end_trim_flag)
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bytestream2_skip(&gb, 2);
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if (control_extension_flag) {
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control_extension_length = bytestream2_get_byte(&gb);
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bytestream2_skip(&gb, control_extension_length);
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}
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return buf + bytestream2_tell(&gb);
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}
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/**
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* Find the end of the current frame in the bitstream.
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* @return the position of the first byte of the next frame, or -1
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*/
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static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
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const uint8_t *buf, int buf_size, int *header_len)
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2014-04-17 10:51:03 +00:00
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{
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OpusParseContext *s = ctx->priv_data;
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2014-10-17 23:25:16 +00:00
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ParseContext *pc = &s->pc;
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int ret, start_found, i = 0, payload_len = 0;
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const uint8_t *payload;
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uint32_t state;
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uint16_t hdr;
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*header_len = 0;
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2014-04-17 10:51:03 +00:00
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if (!buf_size)
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return 0;
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2014-10-17 23:25:16 +00:00
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start_found = pc->frame_start_found;
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state = pc->state;
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payload = buf;
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/* Check if we're using Opus in MPEG-TS framing */
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if (!s->ts_framing && buf_size > 2) {
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hdr = AV_RB16(buf);
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if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
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s->ts_framing = 1;
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}
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if (s->ts_framing && !start_found) {
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for (i = 0; i < buf_size-2; i++) {
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state = (state << 8) | payload[i];
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if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
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payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
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*header_len = payload - buf;
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start_found = 1;
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break;
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}
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}
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}
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if (!s->ts_framing)
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payload_len = buf_size;
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2014-04-17 10:51:03 +00:00
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if (avctx->extradata && !s->extradata_parsed) {
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ret = ff_opus_parse_extradata(avctx, &s->ctx);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
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2014-10-17 23:25:16 +00:00
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return AVERROR_INVALIDDATA;
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2014-04-17 10:51:03 +00:00
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}
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av_freep(&s->ctx.channel_maps);
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s->extradata_parsed = 1;
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}
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2014-10-17 23:25:16 +00:00
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if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
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ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
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pc->frame_start_found = 0;
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return AVERROR_INVALIDDATA;
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}
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ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
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2014-04-17 10:51:03 +00:00
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}
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2014-10-17 23:25:16 +00:00
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if (s->ts_framing) {
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if (start_found) {
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if (payload_len + *header_len <= buf_size) {
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pc->frame_start_found = 0;
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pc->state = -1;
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return payload_len + *header_len;
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}
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}
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pc->frame_start_found = start_found;
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pc->state = state;
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return END_NOT_FOUND;
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}
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2014-04-17 10:51:03 +00:00
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return buf_size;
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}
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2014-10-17 23:25:16 +00:00
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static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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OpusParseContext *s = ctx->priv_data;
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ParseContext *pc = &s->pc;
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int next, header_len;
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next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
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if (s->ts_framing && next != AVERROR_INVALIDDATA &&
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ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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if (next == AVERROR_INVALIDDATA){
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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*poutbuf = buf + header_len;
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*poutbuf_size = buf_size - header_len;
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return next;
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}
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2014-04-17 10:51:03 +00:00
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AVCodecParser ff_opus_parser = {
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.codec_ids = { AV_CODEC_ID_OPUS },
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.priv_data_size = sizeof(OpusParseContext),
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.parser_parse = opus_parse,
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2014-10-17 23:25:16 +00:00
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.parser_close = ff_parse_close
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2014-04-17 10:51:03 +00:00
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};
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