forked from KolibriOS/kolibrios
424 lines
13 KiB
C
424 lines
13 KiB
C
/*
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* Copyright (c) 2012 Andrew D'Addesio
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* Copyright (c) 2013-2014 Mozilla Corporation
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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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* Opus decoder/parser shared code
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*/
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#include <stdint.h>
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#include "libavutil/error.h"
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#include "opus.h"
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#include "vorbis.h"
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static const uint16_t opus_frame_duration[32] = {
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480, 960, 1920, 2880,
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480, 960, 1920, 2880,
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480, 960, 1920, 2880,
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480, 960,
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480, 960,
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120, 240, 480, 960,
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120, 240, 480, 960,
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120, 240, 480, 960,
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120, 240, 480, 960,
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};
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/**
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* Read a 1- or 2-byte frame length
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*/
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static inline int xiph_lacing_16bit(const uint8_t **ptr, const uint8_t *end)
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{
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int val;
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if (*ptr >= end)
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return AVERROR_INVALIDDATA;
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val = *(*ptr)++;
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if (val >= 252) {
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if (*ptr >= end)
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return AVERROR_INVALIDDATA;
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val += 4 * *(*ptr)++;
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}
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return val;
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}
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/**
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* Read a multi-byte length (used for code 3 packet padding size)
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*/
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static inline int xiph_lacing_full(const uint8_t **ptr, const uint8_t *end)
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{
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int val = 0;
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int next;
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while (1) {
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if (*ptr >= end || val > INT_MAX - 254)
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return AVERROR_INVALIDDATA;
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next = *(*ptr)++;
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val += next;
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if (next < 255)
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break;
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else
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val--;
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}
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return val;
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}
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/**
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* Parse Opus packet info from raw packet data
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*/
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int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
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int self_delimiting)
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{
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const uint8_t *ptr = buf;
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const uint8_t *end = buf + buf_size;
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int padding = 0;
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int frame_bytes, i;
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if (buf_size < 1)
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goto fail;
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/* TOC byte */
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i = *ptr++;
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pkt->code = (i ) & 0x3;
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pkt->stereo = (i >> 2) & 0x1;
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pkt->config = (i >> 3) & 0x1F;
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/* code 2 and code 3 packets have at least 1 byte after the TOC */
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if (pkt->code >= 2 && buf_size < 2)
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goto fail;
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switch (pkt->code) {
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case 0:
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/* 1 frame */
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pkt->frame_count = 1;
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pkt->vbr = 0;
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if (self_delimiting) {
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int len = xiph_lacing_16bit(&ptr, end);
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if (len < 0 || len > end - ptr)
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goto fail;
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end = ptr + len;
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buf_size = end - buf;
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}
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frame_bytes = end - ptr;
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if (frame_bytes > MAX_FRAME_SIZE)
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goto fail;
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pkt->frame_offset[0] = ptr - buf;
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pkt->frame_size[0] = frame_bytes;
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break;
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case 1:
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/* 2 frames, equal size */
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pkt->frame_count = 2;
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pkt->vbr = 0;
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if (self_delimiting) {
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int len = xiph_lacing_16bit(&ptr, end);
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if (len < 0 || 2 * len > end - ptr)
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goto fail;
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end = ptr + 2 * len;
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buf_size = end - buf;
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}
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frame_bytes = end - ptr;
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if (frame_bytes & 1 || frame_bytes >> 1 > MAX_FRAME_SIZE)
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goto fail;
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pkt->frame_offset[0] = ptr - buf;
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pkt->frame_size[0] = frame_bytes >> 1;
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pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
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pkt->frame_size[1] = frame_bytes >> 1;
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break;
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case 2:
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/* 2 frames, different sizes */
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pkt->frame_count = 2;
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pkt->vbr = 1;
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/* read 1st frame size */
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frame_bytes = xiph_lacing_16bit(&ptr, end);
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if (frame_bytes < 0)
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goto fail;
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if (self_delimiting) {
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int len = xiph_lacing_16bit(&ptr, end);
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if (len < 0 || len + frame_bytes > end - ptr)
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goto fail;
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end = ptr + frame_bytes + len;
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buf_size = end - buf;
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}
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pkt->frame_offset[0] = ptr - buf;
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pkt->frame_size[0] = frame_bytes;
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/* calculate 2nd frame size */
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frame_bytes = end - ptr - pkt->frame_size[0];
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if (frame_bytes < 0 || frame_bytes > MAX_FRAME_SIZE)
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goto fail;
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pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
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pkt->frame_size[1] = frame_bytes;
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break;
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case 3:
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/* 1 to 48 frames, can be different sizes */
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i = *ptr++;
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pkt->frame_count = (i ) & 0x3F;
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padding = (i >> 6) & 0x01;
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pkt->vbr = (i >> 7) & 0x01;
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if (pkt->frame_count == 0 || pkt->frame_count > MAX_FRAMES)
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goto fail;
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/* read padding size */
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if (padding) {
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padding = xiph_lacing_full(&ptr, end);
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if (padding < 0)
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goto fail;
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}
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/* read frame sizes */
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if (pkt->vbr) {
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/* for VBR, all frames except the final one have their size coded
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in the bitstream. the last frame size is implicit. */
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int total_bytes = 0;
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for (i = 0; i < pkt->frame_count - 1; i++) {
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frame_bytes = xiph_lacing_16bit(&ptr, end);
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if (frame_bytes < 0)
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goto fail;
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pkt->frame_size[i] = frame_bytes;
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total_bytes += frame_bytes;
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}
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if (self_delimiting) {
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int len = xiph_lacing_16bit(&ptr, end);
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if (len < 0 || len + total_bytes + padding > end - ptr)
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goto fail;
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end = ptr + total_bytes + len + padding;
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buf_size = end - buf;
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}
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frame_bytes = end - ptr - padding;
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if (total_bytes > frame_bytes)
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goto fail;
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pkt->frame_offset[0] = ptr - buf;
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for (i = 1; i < pkt->frame_count; i++)
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pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
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pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes;
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} else {
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/* for CBR, the remaining packet bytes are divided evenly between
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the frames */
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if (self_delimiting) {
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frame_bytes = xiph_lacing_16bit(&ptr, end);
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if (frame_bytes < 0 || pkt->frame_count * frame_bytes + padding > end - ptr)
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goto fail;
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end = ptr + pkt->frame_count * frame_bytes + padding;
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buf_size = end - buf;
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} else {
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frame_bytes = end - ptr - padding;
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if (frame_bytes % pkt->frame_count ||
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frame_bytes / pkt->frame_count > MAX_FRAME_SIZE)
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goto fail;
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frame_bytes /= pkt->frame_count;
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}
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pkt->frame_offset[0] = ptr - buf;
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pkt->frame_size[0] = frame_bytes;
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for (i = 1; i < pkt->frame_count; i++) {
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pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
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pkt->frame_size[i] = frame_bytes;
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}
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}
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}
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pkt->packet_size = buf_size;
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pkt->data_size = pkt->packet_size - padding;
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/* total packet duration cannot be larger than 120ms */
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pkt->frame_duration = opus_frame_duration[pkt->config];
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if (pkt->frame_duration * pkt->frame_count > MAX_PACKET_DUR)
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goto fail;
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/* set mode and bandwidth */
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if (pkt->config < 12) {
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pkt->mode = OPUS_MODE_SILK;
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pkt->bandwidth = pkt->config >> 2;
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} else if (pkt->config < 16) {
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pkt->mode = OPUS_MODE_HYBRID;
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pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14);
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} else {
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pkt->mode = OPUS_MODE_CELT;
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pkt->bandwidth = (pkt->config - 16) >> 2;
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/* skip mediumband */
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if (pkt->bandwidth)
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pkt->bandwidth++;
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}
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return 0;
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fail:
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memset(pkt, 0, sizeof(*pkt));
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return AVERROR_INVALIDDATA;
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}
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static int channel_reorder_vorbis(int nb_channels, int channel_idx)
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{
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return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];
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}
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static int channel_reorder_unknown(int nb_channels, int channel_idx)
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{
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return channel_idx;
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}
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av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
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OpusContext *s)
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{
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static const uint8_t default_channel_map[2] = { 0, 1 };
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int (*channel_reorder)(int, int) = channel_reorder_unknown;
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const uint8_t *extradata, *channel_map;
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int extradata_size;
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int version, channels, map_type, streams, stereo_streams, i, j;
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uint64_t layout;
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if (!avctx->extradata) {
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if (avctx->channels > 2) {
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av_log(avctx, AV_LOG_ERROR,
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"Multichannel configuration without extradata.\n");
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return AVERROR(EINVAL);
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}
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extradata = opus_default_extradata;
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extradata_size = sizeof(opus_default_extradata);
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} else {
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extradata = avctx->extradata;
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extradata_size = avctx->extradata_size;
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}
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if (extradata_size < 19) {
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av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
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extradata_size);
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return AVERROR_INVALIDDATA;
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}
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version = extradata[8];
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if (version > 15) {
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avpriv_request_sample(avctx, "Extradata version %d", version);
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return AVERROR_PATCHWELCOME;
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}
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avctx->delay = AV_RL16(extradata + 10);
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channels = avctx->extradata ? extradata[9] : (avctx->channels == 1) ? 1 : 2;
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if (!channels) {
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av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n");
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return AVERROR_INVALIDDATA;
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}
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s->gain_i = AV_RL16(extradata + 16);
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if (s->gain_i)
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s->gain = pow(10, s->gain_i / (20.0 * 256));
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map_type = extradata[18];
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if (!map_type) {
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if (channels > 2) {
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av_log(avctx, AV_LOG_ERROR,
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"Channel mapping 0 is only specified for up to 2 channels\n");
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return AVERROR_INVALIDDATA;
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}
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layout = (channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
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streams = 1;
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stereo_streams = channels - 1;
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channel_map = default_channel_map;
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} else if (map_type == 1 || map_type == 255) {
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if (extradata_size < 21 + channels) {
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av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
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extradata_size);
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return AVERROR_INVALIDDATA;
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}
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streams = extradata[19];
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stereo_streams = extradata[20];
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if (!streams || stereo_streams > streams ||
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streams + stereo_streams > 255) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams);
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return AVERROR_INVALIDDATA;
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}
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if (map_type == 1) {
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if (channels > 8) {
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av_log(avctx, AV_LOG_ERROR,
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"Channel mapping 1 is only specified for up to 8 channels\n");
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return AVERROR_INVALIDDATA;
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}
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layout = ff_vorbis_channel_layouts[channels - 1];
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channel_reorder = channel_reorder_vorbis;
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} else
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layout = 0;
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channel_map = extradata + 21;
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} else {
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avpriv_request_sample(avctx, "Mapping type %d", map_type);
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return AVERROR_PATCHWELCOME;
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}
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s->channel_maps = av_mallocz_array(channels, sizeof(*s->channel_maps));
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if (!s->channel_maps)
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return AVERROR(ENOMEM);
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for (i = 0; i < channels; i++) {
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ChannelMap *map = &s->channel_maps[i];
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uint8_t idx = channel_map[channel_reorder(channels, i)];
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if (idx == 255) {
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map->silence = 1;
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continue;
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} else if (idx >= streams + stereo_streams) {
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av_log(avctx, AV_LOG_ERROR,
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"Invalid channel map for output channel %d: %d\n", i, idx);
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return AVERROR_INVALIDDATA;
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}
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/* check that we din't see this index yet */
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map->copy = 0;
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for (j = 0; j < i; j++)
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if (channel_map[channel_reorder(channels, j)] == idx) {
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map->copy = 1;
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map->copy_idx = j;
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break;
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}
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if (idx < 2 * stereo_streams) {
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map->stream_idx = idx / 2;
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map->channel_idx = idx & 1;
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} else {
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map->stream_idx = idx - stereo_streams;
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map->channel_idx = 0;
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}
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}
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avctx->channels = channels;
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avctx->channel_layout = layout;
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s->nb_streams = streams;
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s->nb_stereo_streams = stereo_streams;
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return 0;
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}
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