| /* | |
| * 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 "opus_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; | |
| } |