From b70d7a4ac72d23f3448f3b08b770fdf5f57de222 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Thu, 17 Apr 2014 12:51:03 +0200 Subject: lavc: add a native Opus decoder. Initial implementation by Andrew D'Addesio during GSoC 2012. Completion by Anton Khirnov , sponsored by the Mozilla Corporation. Further contributions by: Christophe Gisquet Janne Grunau Luca Barbato --- libavcodec/opus.c | 428 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 428 insertions(+) create mode 100644 libavcodec/opus.c (limited to 'libavcodec/opus.c') diff --git a/libavcodec/opus.c b/libavcodec/opus.c new file mode 100644 index 0000000000..91021ce65a --- /dev/null +++ b/libavcodec/opus.c @@ -0,0 +1,428 @@ +/* + * Copyright (c) 2012 Andrew D'Addesio + * Copyright (c) 2013-2014 Mozilla Corporation + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 + +#include "libavutil/error.h" + +#include "opus.h" +#include "vorbis.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 > 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 > 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 > 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 > 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 > 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 > 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 mediumband */ + 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, + OpusContext *s) +{ + static const uint8_t default_channel_map[2] = { 0, 1 }; + uint8_t default_extradata[19] = { + 'O', 'p', 'u', 's', 'H', 'e', 'a', 'd', + 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + }; + + int (*channel_reorder)(int, int) = channel_reorder_unknown; + + const uint8_t *extradata, *channel_map; + int extradata_size; + int version, channels, map_type, streams, stereo_streams, i, j; + uint64_t layout; + + if (!avctx->extradata) { + if (avctx->channels > 2) { + av_log(avctx, AV_LOG_ERROR, + "Multichannel configuration without extradata.\n"); + return AVERROR(EINVAL); + } + default_extradata[9] = (avctx->channels == 1) ? 1 : 2; + extradata = default_extradata; + extradata_size = sizeof(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); + + channels = extradata[9]; + if (!channels) { + av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n"); + return AVERROR_INVALIDDATA; + } + + s->gain_i = AV_RL16(extradata + 16); + if (s->gain_i) + s->gain = pow(10, s->gain_i / (20.0 * 256)); + + 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"); + return AVERROR_INVALIDDATA; + } + layout = (channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; + streams = 1; + stereo_streams = channels - 1; + channel_map = default_channel_map; + } else if (map_type == 1 || map_type == 255) { + if (extradata_size < 21 + channels) { + av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", + extradata_size); + return AVERROR_INVALIDDATA; + } + + 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); + return AVERROR_INVALIDDATA; + } + + 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"); + return AVERROR_INVALIDDATA; + } + layout = ff_vorbis_channel_layouts[channels - 1]; + channel_reorder = channel_reorder_vorbis; + } else + layout = 0; + + channel_map = extradata + 21; + } else { + avpriv_request_sample(avctx, "Mapping type %d", map_type); + return AVERROR_PATCHWELCOME; + } + + s->channel_maps = av_mallocz_array(channels, sizeof(*s->channel_maps)); + if (!s->channel_maps) + return AVERROR(ENOMEM); + + 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); + return AVERROR_INVALIDDATA; + } + + /* check that we din't 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; + } + } + + avctx->channels = channels; + avctx->channel_layout = layout; + s->nb_streams = streams; + s->nb_stereo_streams = stereo_streams; + + return 0; +} -- cgit v1.2.3