| /* |
| * 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 <stdint.h> |
| |
| #include "libavutil/error.h" |
| #include "libavutil/ffmath.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 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, |
| OpusContext *s) |
| { |
| static const uint8_t default_channel_map[2] = { 0, 1 }; |
| |
| 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); |
| } |
| 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); |
| |
| channels = avctx->extradata ? extradata[9] : (avctx->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); |
| if (s->gain_i) |
| s->gain = ff_exp10(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 == 2 || 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 if (map_type == 2) { |
| int ambisonic_order = ff_sqrt(channels) - 1; |
| if (channels != (ambisonic_order + 1) * (ambisonic_order + 1)) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Channel mapping 2 is only specified for channel counts" |
| " which can be written as (n + 1)^2 for nonnegative integer n\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| layout = 0; |
| } 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); |
| av_freep(&s->channel_maps); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* 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; |
| } |
| } |
| |
| avctx->channels = channels; |
| avctx->channel_layout = layout; |
| s->nb_streams = streams; |
| s->nb_stereo_streams = stereo_streams; |
| |
| return 0; |
| } |
