mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-09 17:08:25 -05:00
199 lines
5.8 KiB
C
Executable File
199 lines
5.8 KiB
C
Executable File
/*
|
|
* Copyright (c) 2013-2014 Mozilla Corporation
|
|
*
|
|
* 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
|
|
* Opus parser
|
|
*
|
|
* Determines the duration for each packet.
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "opus.h"
|
|
#include "parser.h"
|
|
|
|
typedef struct OpusParseContext {
|
|
ParseContext pc;
|
|
OpusContext ctx;
|
|
OpusPacket pkt;
|
|
int extradata_parsed;
|
|
int ts_framing;
|
|
} OpusParseContext;
|
|
|
|
static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_len, int buf_len)
|
|
{
|
|
const uint8_t *buf = start + 1;
|
|
int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length;
|
|
uint8_t flags;
|
|
uint64_t payload_len_tmp;
|
|
|
|
GetByteContext gb;
|
|
bytestream2_init(&gb, buf, buf_len);
|
|
|
|
flags = bytestream2_get_byte(&gb);
|
|
start_trim_flag = (flags >> 4) & 1;
|
|
end_trim_flag = (flags >> 3) & 1;
|
|
control_extension_flag = (flags >> 2) & 1;
|
|
|
|
payload_len_tmp = *payload_len = 0;
|
|
while (bytestream2_peek_byte(&gb) == 0xff)
|
|
payload_len_tmp += bytestream2_get_byte(&gb);
|
|
|
|
payload_len_tmp += bytestream2_get_byte(&gb);
|
|
|
|
if (start_trim_flag)
|
|
bytestream2_skip(&gb, 2);
|
|
if (end_trim_flag)
|
|
bytestream2_skip(&gb, 2);
|
|
if (control_extension_flag) {
|
|
control_extension_length = bytestream2_get_byte(&gb);
|
|
bytestream2_skip(&gb, control_extension_length);
|
|
}
|
|
|
|
if (bytestream2_tell(&gb) + payload_len_tmp > buf_len)
|
|
return NULL;
|
|
|
|
*payload_len = payload_len_tmp;
|
|
|
|
return buf + bytestream2_tell(&gb);
|
|
}
|
|
|
|
/**
|
|
* Find the end of the current frame in the bitstream.
|
|
* @return the position of the first byte of the next frame, or -1
|
|
*/
|
|
static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
|
|
const uint8_t *buf, int buf_size, int *header_len)
|
|
{
|
|
OpusParseContext *s = ctx->priv_data;
|
|
ParseContext *pc = &s->pc;
|
|
int ret, start_found, i = 0, payload_len = 0;
|
|
const uint8_t *payload;
|
|
uint32_t state;
|
|
uint16_t hdr;
|
|
*header_len = 0;
|
|
|
|
if (!buf_size)
|
|
return 0;
|
|
|
|
start_found = pc->frame_start_found;
|
|
state = pc->state;
|
|
payload = buf;
|
|
|
|
/* Check if we're using Opus in MPEG-TS framing */
|
|
if (!s->ts_framing && buf_size > 2) {
|
|
hdr = AV_RB16(buf);
|
|
if ((hdr & OPUS_TS_MASK) == OPUS_TS_HEADER)
|
|
s->ts_framing = 1;
|
|
}
|
|
|
|
if (s->ts_framing && !start_found) {
|
|
for (i = 0; i < buf_size-2; i++) {
|
|
state = (state << 8) | payload[i];
|
|
if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
|
|
payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
|
|
if (!payload) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
*header_len = payload - buf;
|
|
start_found = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!s->ts_framing)
|
|
payload_len = buf_size;
|
|
|
|
if (avctx->extradata && !s->extradata_parsed) {
|
|
ret = ff_opus_parse_extradata(avctx, &s->ctx);
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg extradata.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
av_freep(&s->ctx.channel_maps);
|
|
s->extradata_parsed = 1;
|
|
}
|
|
|
|
if (payload_len <= buf_size && (!s->ts_framing || start_found)) {
|
|
ret = ff_opus_parse_packet(&s->pkt, payload, payload_len, s->ctx.nb_streams > 1);
|
|
if (ret < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error parsing Opus packet header.\n");
|
|
pc->frame_start_found = 0;
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
ctx->duration = s->pkt.frame_count * s->pkt.frame_duration;
|
|
}
|
|
|
|
if (s->ts_framing) {
|
|
if (start_found) {
|
|
if (payload_len + *header_len <= buf_size) {
|
|
pc->frame_start_found = 0;
|
|
pc->state = -1;
|
|
return payload_len + *header_len;
|
|
}
|
|
}
|
|
|
|
pc->frame_start_found = start_found;
|
|
pc->state = state;
|
|
return END_NOT_FOUND;
|
|
}
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static int opus_parse(AVCodecParserContext *ctx, AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
OpusParseContext *s = ctx->priv_data;
|
|
ParseContext *pc = &s->pc;
|
|
int next, header_len;
|
|
|
|
next = opus_find_frame_end(ctx, avctx, buf, buf_size, &header_len);
|
|
|
|
if (s->ts_framing && next != AVERROR_INVALIDDATA &&
|
|
ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
if (next == AVERROR_INVALIDDATA){
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
*poutbuf = buf + header_len;
|
|
*poutbuf_size = buf_size - header_len;
|
|
return next;
|
|
}
|
|
|
|
AVCodecParser ff_opus_parser = {
|
|
.codec_ids = { AV_CODEC_ID_OPUS },
|
|
.priv_data_size = sizeof(OpusParseContext),
|
|
.parser_parse = opus_parse,
|
|
.parser_close = ff_parse_close
|
|
};
|