/* * Copyright (c) 2012 Andrew D'Addesio * 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 decoder/parser shared code */ #include "libavutil/attributes.h"#include "libavutil/channel_layout.h"#include "libavutil/error.h"#include "libavutil/intreadwrite.h"#include "libavutil/log.h"#include "libavutil/mem.h" #include "avcodec.h"#include "internal.h"#include "mathops.h"#include "opus.h"#include "parse.h"#include "vorbis_data.h" static const uint16_t opus_frame_duration[32] = { 480, 960, 1920, 2880, 480, 960, 1920, 2880, 480, 960, 1920, 2880, 480, 960, 480, 960, 120, 240, 480, 960, 120, 240, 480, 960, 120, 240, 480, 960, 120, 240, 480, 960,}; /** * Read a 1- or 2-byte frame length */static inline int xiph_lacing_16bit(const uint8_t **ptr, const uint8_t *end){ int val; if (*ptr >= end) return AVERROR_INVALIDDATA; val = *(*ptr)++; if (val >= 252) { if (*ptr >= end) return AVERROR_INVALIDDATA; val += 4 * *(*ptr)++; } return val;} /** * Read a multi-byte length (used for code 3 packet padding size) */static inline int xiph_lacing_full(const uint8_t **ptr, const uint8_t *end){ int val = 0; int next; while (1) { if (*ptr >= end || val > INT_MAX - 254) return AVERROR_INVALIDDATA; next = *(*ptr)++; val += next; if (next < 255) break; else val--; } return val;} /** * Parse Opus packet info from raw packet data */int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size, int self_delimiting){ const uint8_t *ptr = buf; const uint8_t *end = buf + buf_size; int padding = 0; int frame_bytes, i; if (buf_size < 1) goto fail; /* TOC byte */ i = *ptr++; pkt->code = (i ) & 0x3; pkt->stereo = (i >> 2) & 0x1; pkt->config = (i >> 3) & 0x1F; /* code 2 and code 3 packets have at least 1 byte after the TOC */ if (pkt->code >= 2 && buf_size < 2) goto fail; switch (pkt->code) { case 0: /* 1 frame */ pkt->frame_count = 1; pkt->vbr = 0; if (self_delimiting) { int len = xiph_lacing_16bit(&ptr, end); if (len < 0 || len > end - ptr) goto fail; end = ptr + len; buf_size = end - buf; } frame_bytes = end - ptr; if (frame_bytes > OPUS_MAX_FRAME_SIZE) goto fail; pkt->frame_offset[0] = ptr - buf; pkt->frame_size[0] = frame_bytes; break; case 1: /* 2 frames, equal size */ pkt->frame_count = 2; pkt->vbr = 0; if (self_delimiting) { int len = xiph_lacing_16bit(&ptr, end); if (len < 0 || 2 * len > end - ptr) goto fail; end = ptr + 2 * len; buf_size = end - buf; } frame_bytes = end - ptr; if (frame_bytes & 1 || frame_bytes >> 1 > OPUS_MAX_FRAME_SIZE) goto fail; pkt->frame_offset[0] = ptr - buf; pkt->frame_size[0] = frame_bytes >> 1; pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0]; pkt->frame_size[1] = frame_bytes >> 1; break; case 2: /* 2 frames, different sizes */ pkt->frame_count = 2; pkt->vbr = 1; /* read 1st frame size */ frame_bytes = xiph_lacing_16bit(&ptr, end); if (frame_bytes < 0) goto fail; if (self_delimiting) { int len = xiph_lacing_16bit(&ptr, end); if (len < 0 || len + frame_bytes > end - ptr) goto fail; end = ptr + frame_bytes + len; buf_size = end - buf; } pkt->frame_offset[0] = ptr - buf; pkt->frame_size[0] = frame_bytes; /* calculate 2nd frame size */ frame_bytes = end - ptr - pkt->frame_size[0]; if (frame_bytes < 0 || frame_bytes > OPUS_MAX_FRAME_SIZE) goto fail; pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0]; pkt->frame_size[1] = frame_bytes; break; case 3: /* 1 to 48 frames, can be different sizes */ i = *ptr++; pkt->frame_count = (i ) & 0x3F; padding = (i >> 6) & 0x01; pkt->vbr = (i >> 7) & 0x01; if (pkt->frame_count == 0 || pkt->frame_count > OPUS_MAX_FRAMES) goto fail; /* read padding size */ if (padding) { padding = xiph_lacing_full(&ptr, end); if (padding < 0) goto fail; } /* read frame sizes */ if (pkt->vbr) { /* for VBR, all frames except the final one have their size coded in the bitstream. the last frame size is implicit. */ int total_bytes = 0; for (i = 0; i < pkt->frame_count - 1; i++) { frame_bytes = xiph_lacing_16bit(&ptr, end); if (frame_bytes < 0) goto fail; pkt->frame_size[i] = frame_bytes; total_bytes += frame_bytes; } if (self_delimiting) { int len = xiph_lacing_16bit(&ptr, end); if (len < 0 || len + total_bytes + padding > end - ptr) goto fail; end = ptr + total_bytes + len + padding; buf_size = end - buf; } frame_bytes = end - ptr - padding; if (total_bytes > frame_bytes) goto fail; pkt->frame_offset[0] = ptr - buf; for (i = 1; i < pkt->frame_count; i++) pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1]; pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes; } else { /* for CBR, the remaining packet bytes are divided evenly between the frames */ if (self_delimiting) { frame_bytes = xiph_lacing_16bit(&ptr, end); if (frame_bytes < 0 || pkt->frame_count * frame_bytes + padding > end - ptr) goto fail; end = ptr + pkt->frame_count * frame_bytes + padding; buf_size = end - buf; } else { frame_bytes = end - ptr - padding; if (frame_bytes % pkt->frame_count || frame_bytes / pkt->frame_count > OPUS_MAX_FRAME_SIZE) goto fail; frame_bytes /= pkt->frame_count; } pkt->frame_offset[0] = ptr - buf; pkt->frame_size[0] = frame_bytes; for (i = 1; i < pkt->frame_count; i++) { pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1]; pkt->frame_size[i] = frame_bytes; } } } pkt->packet_size = buf_size; pkt->data_size = pkt->packet_size - padding; /* total packet duration cannot be larger than 120ms */ pkt->frame_duration = opus_frame_duration[pkt->config]; if (pkt->frame_duration * pkt->frame_count > OPUS_MAX_PACKET_DUR) goto fail; /* set mode and bandwidth */ if (pkt->config < 12) { pkt->mode = OPUS_MODE_SILK; pkt->bandwidth = pkt->config >> 2; } else if (pkt->config < 16) { pkt->mode = OPUS_MODE_HYBRID; pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14); } else { pkt->mode = OPUS_MODE_CELT; pkt->bandwidth = (pkt->config - 16) >> 2; /* skip medium band */ if (pkt->bandwidth) pkt->bandwidth++; } return 0; fail: memset(pkt, 0, sizeof(*pkt)); return AVERROR_INVALIDDATA;} static int channel_reorder_vorbis(int nb_channels, int channel_idx){ return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];} static int channel_reorder_unknown(int nb_channels, int channel_idx){ return channel_idx;} av_cold int ff_opus_parse_extradata(AVCodecContext *avctx, OpusParseContext *s){ static const uint8_t default_channel_map[2] = { 0, 1 }; int (*channel_reorder)(int, int) = channel_reorder_unknown; int channels = avctx->ch_layout.nb_channels; const uint8_t *extradata, *channel_map; int extradata_size; int version, map_type, streams, stereo_streams, i, j, ret; AVChannelLayout layout = { 0 }; if (!avctx->extradata) { if (channels > 2) { av_log(avctx, AV_LOG_ERROR, "Multichannel configuration without extradata.\n"); return AVERROR(EINVAL); } extradata = opus_default_extradata; extradata_size = sizeof(opus_default_extradata); } else { extradata = avctx->extradata; extradata_size = avctx->extradata_size; } if (extradata_size < 19) { av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extradata_size); return AVERROR_INVALIDDATA; } version = extradata[8]; if (version > 15) { avpriv_request_sample(avctx, "Extradata version %d", version); return AVERROR_PATCHWELCOME; } avctx->delay = AV_RL16(extradata + 10); if (avctx->internal) avctx->internal->skip_samples = avctx->delay; channels = avctx->extradata ? extradata[9] : (channels == 1) ? 1 : 2; if (!channels) { av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extradata\n"); return AVERROR_INVALIDDATA; } s->gain_i = AV_RL16(extradata + 16); map_type = extradata[18]; if (!map_type) { if (channels > 2) { av_log(avctx, AV_LOG_ERROR, "Channel mapping 0 is only specified for up to 2 channels\n"); ret = AVERROR_INVALIDDATA; goto fail; } layout = (channels == 1) ? (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO : (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; streams = 1; stereo_streams = channels - 1; channel_map = default_channel_map; } else if (map_type == 1 || map_type == 2 || map_type == 255) { if (extradata_size < 21 + channels) { av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extradata_size); ret = AVERROR_INVALIDDATA; goto fail; } streams = extradata[19]; stereo_streams = extradata[20]; if (!streams || stereo_streams > streams || streams + stereo_streams > 255) { av_log(avctx, AV_LOG_ERROR, "Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams); ret = AVERROR_INVALIDDATA; goto fail; } if (map_type == 1) { if (channels > 8) { av_log(avctx, AV_LOG_ERROR, "Channel mapping 1 is only specified for up to 8 channels\n"); ret = AVERROR_INVALIDDATA; goto fail; } av_channel_layout_copy(&layout, &ff_vorbis_ch_layouts[channels - 1]); channel_reorder = channel_reorder_vorbis; } else if (map_type == 2) { int ambisonic_order = ff_sqrt(channels) - 1; if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1)) && channels != ((ambisonic_order + 1) * (ambisonic_order + 1) + 2)) { av_log(avctx, AV_LOG_ERROR, "Channel mapping 2 is only specified for channel counts" " which can be written as (n + 1)^2 or (n + 1)^2 + 2" " for nonnegative integer n\n"); ret = AVERROR_INVALIDDATA; goto fail; } if (channels > 227) { av_log(avctx, AV_LOG_ERROR, "Too many channels\n"); ret = AVERROR_INVALIDDATA; goto fail; } layout.order = AV_CHANNEL_ORDER_AMBISONIC; layout.nb_channels = channels; if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1))) layout.u.mask = AV_CH_LAYOUT_STEREO; } else { layout.order = AV_CHANNEL_ORDER_UNSPEC; layout.nb_channels = channels; } channel_map = extradata + 21; } else { avpriv_request_sample(avctx, "Mapping type %d", map_type); return AVERROR_PATCHWELCOME; } s->channel_maps = av_calloc(channels, sizeof(*s->channel_maps)); if (!s->channel_maps) { ret = AVERROR(ENOMEM); goto fail; } for (i = 0; i < channels; i++) { ChannelMap *map = &s->channel_maps[i]; uint8_t idx = channel_map[channel_reorder(channels, i)]; if (idx == 255) { map->silence = 1; continue; } else if (idx >= streams + stereo_streams) { av_log(avctx, AV_LOG_ERROR, "Invalid channel map for output channel %d: %d\n", i, idx); av_freep(&s->channel_maps); ret = AVERROR_INVALIDDATA; goto fail; } /* check that we did not see this index yet */ map->copy = 0; for (j = 0; j < i; j++) if (channel_map[channel_reorder(channels, j)] == idx) { map->copy = 1; map->copy_idx = j; break; } if (idx < 2 * stereo_streams) { map->stream_idx = idx / 2; map->channel_idx = idx & 1; } else { map->stream_idx = idx - stereo_streams; map->channel_idx = 0; } } ret = av_channel_layout_copy(&avctx->ch_layout, &layout); if (ret < 0) goto fail; s->nb_streams = streams; s->nb_stereo_streams = stereo_streams; return 0;fail: av_channel_layout_uninit(&layout); return ret;}
/*
* Copyright (c) 2012 Andrew D'Addesio
* 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 decoder/parser shared code
*/
#include "libavutil/attributes.h"
#include "libavutil/channel_layout.h"
#include "libavutil/error.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "internal.h"
#include "mathops.h"
#include "opus.h"
#include "parse.h"
#include "vorbis_data.h"
static const uint16_t opus_frame_duration[32] = {
480, 960, 1920, 2880,
480, 960, 1920, 2880,
480, 960, 1920, 2880,
480, 960,
480, 960,
120, 240, 480, 960,
120, 240, 480, 960,
120, 240, 480, 960,
120, 240, 480, 960,
};
/**
* Read a 1- or 2-byte frame length
*/
static inline int xiph_lacing_16bit(const uint8_t **ptr, const uint8_t *end)
{
int val;
if (*ptr >= end)
return AVERROR_INVALIDDATA;
val = *(*ptr)++;
if (val >= 252) {
if (*ptr >= end)
return AVERROR_INVALIDDATA;
val += 4 * *(*ptr)++;
}
return val;
}
/**
* Read a multi-byte length (used for code 3 packet padding size)
*/
static inline int xiph_lacing_full(const uint8_t **ptr, const uint8_t *end)
{
int val = 0;
int next;
while (1) {
if (*ptr >= end || val > INT_MAX - 254)
return AVERROR_INVALIDDATA;
next = *(*ptr)++;
val += next;
if (next < 255)
break;
else
val--;
}
return val;
}
/**
* Parse Opus packet info from raw packet data
*/
int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
int self_delimiting)
{
const uint8_t *ptr = buf;
const uint8_t *end = buf + buf_size;
int padding = 0;
int frame_bytes, i;
if (buf_size < 1)
goto fail;
/* TOC byte */
i = *ptr++;
pkt->code = (i ) & 0x3;
pkt->stereo = (i >> 2) & 0x1;
pkt->config = (i >> 3) & 0x1F;
/* code 2 and code 3 packets have at least 1 byte after the TOC */
if (pkt->code >= 2 && buf_size < 2)
goto fail;
switch (pkt->code) {
case 0:
/* 1 frame */
pkt->frame_count = 1;
pkt->vbr = 0;
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || len > end - ptr)
goto fail;
end = ptr + len;
buf_size = end - buf;
}
frame_bytes = end - ptr;
if (frame_bytes > OPUS_MAX_FRAME_SIZE)
goto fail;
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes;
break;
case 1:
/* 2 frames, equal size */
pkt->frame_count = 2;
pkt->vbr = 0;
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || 2 * len > end - ptr)
goto fail;
end = ptr + 2 * len;
buf_size = end - buf;
}
frame_bytes = end - ptr;
if (frame_bytes & 1 || frame_bytes >> 1 > OPUS_MAX_FRAME_SIZE)
goto fail;
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes >> 1;
pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
pkt->frame_size[1] = frame_bytes >> 1;
break;
case 2:
/* 2 frames, different sizes */
pkt->frame_count = 2;
pkt->vbr = 1;
/* read 1st frame size */
frame_bytes = xiph_lacing_16bit(&ptr, end);
if (frame_bytes < 0)
goto fail;
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || len + frame_bytes > end - ptr)
goto fail;
end = ptr + frame_bytes + len;
buf_size = end - buf;
}
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes;
/* calculate 2nd frame size */
frame_bytes = end - ptr - pkt->frame_size[0];
if (frame_bytes < 0 || frame_bytes > OPUS_MAX_FRAME_SIZE)
goto fail;
pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
pkt->frame_size[1] = frame_bytes;
break;
case 3:
/* 1 to 48 frames, can be different sizes */
i = *ptr++;
pkt->frame_count = (i ) & 0x3F;
padding = (i >> 6) & 0x01;
pkt->vbr = (i >> 7) & 0x01;
if (pkt->frame_count == 0 || pkt->frame_count > OPUS_MAX_FRAMES)
goto fail;
/* read padding size */
if (padding) {
padding = xiph_lacing_full(&ptr, end);
if (padding < 0)
goto fail;
}
/* read frame sizes */
if (pkt->vbr) {
/* for VBR, all frames except the final one have their size coded
in the bitstream. the last frame size is implicit. */
int total_bytes = 0;
for (i = 0; i < pkt->frame_count - 1; i++) {
frame_bytes = xiph_lacing_16bit(&ptr, end);
if (frame_bytes < 0)
goto fail;
pkt->frame_size[i] = frame_bytes;
total_bytes += frame_bytes;
}
if (self_delimiting) {
int len = xiph_lacing_16bit(&ptr, end);
if (len < 0 || len + total_bytes + padding > end - ptr)
goto fail;
end = ptr + total_bytes + len + padding;
buf_size = end - buf;
}
frame_bytes = end - ptr - padding;
if (total_bytes > frame_bytes)
goto fail;
pkt->frame_offset[0] = ptr - buf;
for (i = 1; i < pkt->frame_count; i++)
pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes;
} else {
/* for CBR, the remaining packet bytes are divided evenly between
the frames */
if (self_delimiting) {
frame_bytes = xiph_lacing_16bit(&ptr, end);
if (frame_bytes < 0 || pkt->frame_count * frame_bytes + padding > end - ptr)
goto fail;
end = ptr + pkt->frame_count * frame_bytes + padding;
buf_size = end - buf;
} else {
frame_bytes = end - ptr - padding;
if (frame_bytes % pkt->frame_count ||
frame_bytes / pkt->frame_count > OPUS_MAX_FRAME_SIZE)
goto fail;
frame_bytes /= pkt->frame_count;
}
pkt->frame_offset[0] = ptr - buf;
pkt->frame_size[0] = frame_bytes;
for (i = 1; i < pkt->frame_count; i++) {
pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
pkt->frame_size[i] = frame_bytes;
}
}
}
pkt->packet_size = buf_size;
pkt->data_size = pkt->packet_size - padding;
/* total packet duration cannot be larger than 120ms */
pkt->frame_duration = opus_frame_duration[pkt->config];
if (pkt->frame_duration * pkt->frame_count > OPUS_MAX_PACKET_DUR)
goto fail;
/* set mode and bandwidth */
if (pkt->config < 12) {
pkt->mode = OPUS_MODE_SILK;
pkt->bandwidth = pkt->config >> 2;
} else if (pkt->config < 16) {
pkt->mode = OPUS_MODE_HYBRID;
pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14);
} else {
pkt->mode = OPUS_MODE_CELT;
pkt->bandwidth = (pkt->config - 16) >> 2;
/* skip medium band */
if (pkt->bandwidth)
pkt->bandwidth++;
}
return 0;
fail:
memset(pkt, 0, sizeof(*pkt));
return AVERROR_INVALIDDATA;
}
static int channel_reorder_vorbis(int nb_channels, int channel_idx)
{
return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];
}
static int channel_reorder_unknown(int nb_channels, int channel_idx)
{
return channel_idx;
}
av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
OpusParseContext *s)
{
static const uint8_t default_channel_map[2] = { 0, 1 };
int (*channel_reorder)(int, int) = channel_reorder_unknown;
int channels = avctx->ch_layout.nb_channels;
const uint8_t *extradata, *channel_map;
int extradata_size;
int version, map_type, streams, stereo_streams, i, j, ret;
AVChannelLayout layout = { 0 };
if (!avctx->extradata) {
if (channels > 2) {
av_log(avctx, AV_LOG_ERROR,
"Multichannel configuration without extradata.\n");
return AVERROR(EINVAL);
}
extradata = opus_default_extradata;
extradata_size = sizeof(opus_default_extradata);
} else {
extradata = avctx->extradata;
extradata_size = avctx->extradata_size;
}
if (extradata_size < 19) {
av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
extradata_size);
return AVERROR_INVALIDDATA;
}
version = extradata[8];
if (version > 15) {
avpriv_request_sample(avctx, "Extradata version %d", version);
return AVERROR_PATCHWELCOME;
}
avctx->delay = AV_RL16(extradata + 10);
if (avctx->internal)
avctx->internal->skip_samples = avctx->delay;
channels = avctx->extradata ? extradata[9] : (channels == 1) ? 1 : 2;
if (!channels) {
av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extradata\n");
return AVERROR_INVALIDDATA;
}
s->gain_i = AV_RL16(extradata + 16);
map_type = extradata[18];
if (!map_type) {
if (channels > 2) {
av_log(avctx, AV_LOG_ERROR,
"Channel mapping 0 is only specified for up to 2 channels\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
layout = (channels == 1) ? (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO :
(AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
streams = 1;
stereo_streams = channels - 1;
channel_map = default_channel_map;
} else if (map_type == 1 || map_type == 2 || map_type == 255) {
if (extradata_size < 21 + channels) {
av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
extradata_size);
ret = AVERROR_INVALIDDATA;
goto fail;
}
streams = extradata[19];
stereo_streams = extradata[20];
if (!streams || stereo_streams > streams ||
streams + stereo_streams > 255) {
av_log(avctx, AV_LOG_ERROR,
"Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams);
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (map_type == 1) {
if (channels > 8) {
av_log(avctx, AV_LOG_ERROR,
"Channel mapping 1 is only specified for up to 8 channels\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
av_channel_layout_copy(&layout, &ff_vorbis_ch_layouts[channels - 1]);
channel_reorder = channel_reorder_vorbis;
} else if (map_type == 2) {
int ambisonic_order = ff_sqrt(channels) - 1;
if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1)) &&
channels != ((ambisonic_order + 1) * (ambisonic_order + 1) + 2)) {
av_log(avctx, AV_LOG_ERROR,
"Channel mapping 2 is only specified for channel counts"
" which can be written as (n + 1)^2 or (n + 1)^2 + 2"
" for nonnegative integer n\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (channels > 227) {
av_log(avctx, AV_LOG_ERROR, "Too many channels\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
layout.order = AV_CHANNEL_ORDER_AMBISONIC;
layout.nb_channels = channels;
if (channels != ((ambisonic_order + 1) * (ambisonic_order + 1)))
layout.u.mask = AV_CH_LAYOUT_STEREO;
} else {
layout.order = AV_CHANNEL_ORDER_UNSPEC;
layout.nb_channels = channels;
}
channel_map = extradata + 21;
} else {
avpriv_request_sample(avctx, "Mapping type %d", map_type);
return AVERROR_PATCHWELCOME;
}
s->channel_maps = av_calloc(channels, sizeof(*s->channel_maps));
if (!s->channel_maps) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (i = 0; i < channels; i++) {
ChannelMap *map = &s->channel_maps[i];
uint8_t idx = channel_map[channel_reorder(channels, i)];
if (idx == 255) {
map->silence = 1;
continue;
} else if (idx >= streams + stereo_streams) {
av_log(avctx, AV_LOG_ERROR,
"Invalid channel map for output channel %d: %d\n", i, idx);
av_freep(&s->channel_maps);
ret = AVERROR_INVALIDDATA;
goto fail;
}
/* check that we did not see this index yet */
map->copy = 0;
for (j = 0; j < i; j++)
if (channel_map[channel_reorder(channels, j)] == idx) {
map->copy = 1;
map->copy_idx = j;
break;
}
if (idx < 2 * stereo_streams) {
map->stream_idx = idx / 2;
map->channel_idx = idx & 1;
} else {
map->stream_idx = idx - stereo_streams;
map->channel_idx = 0;
}
}
ret = av_channel_layout_copy(&avctx->ch_layout, &layout);
if (ret < 0)
goto fail;
s->nb_streams = streams;
s->nb_stereo_streams = stereo_streams;
return 0;
fail:
av_channel_layout_uninit(&layout);
return ret;
}