| /* | |
| * SMPTE 302M decoder | |
| * Copyright (c) 2008 Laurent Aimar <fenrir@videolan.org> | |
| * Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com> | |
| * | |
| * 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 | |
| */ | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/opt.h" | |
| #include "libavutil/log.h" | |
| #include "libavutil/reverse.h" | |
| #include "avcodec.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| #define AES3_HEADER_LEN 4 | |
| typedef struct S302Context { | |
| AVClass *class; | |
| int non_pcm_mode; | |
| } S302Context; | |
| static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf, | |
| int buf_size) | |
| { | |
| uint32_t h; | |
| int frame_size, channels, bits; | |
| if (buf_size <= AES3_HEADER_LEN) { | |
| av_log(avctx, AV_LOG_ERROR, "frame is too short\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| /* | |
| * AES3 header : | |
| * size: 16 | |
| * number channels 2 | |
| * channel_id 8 | |
| * bits per samples 2 | |
| * alignments 4 | |
| */ | |
| h = AV_RB32(buf); | |
| frame_size = (h >> 16) & 0xffff; | |
| channels = ((h >> 14) & 0x0003) * 2 + 2; | |
| bits = ((h >> 4) & 0x0003) * 4 + 16; | |
| if (AES3_HEADER_LEN + frame_size != buf_size || bits > 24) { | |
| av_log(avctx, AV_LOG_ERROR, "frame has invalid header\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| /* Set output properties */ | |
| avctx->bits_per_raw_sample = bits; | |
| if (bits > 16) | |
| avctx->sample_fmt = AV_SAMPLE_FMT_S32; | |
| else | |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
| av_channel_layout_uninit(&avctx->ch_layout); | |
| switch(channels) { | |
| case 2: | |
| avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| break; | |
| case 4: | |
| avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_QUAD; | |
| break; | |
| case 6: | |
| avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_5POINT1_BACK; | |
| break; | |
| case 8: | |
| av_channel_layout_from_mask(&avctx->ch_layout, | |
| AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX); | |
| break; | |
| default: | |
| avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC; | |
| avctx->ch_layout.nb_channels = channels; | |
| break; | |
| } | |
| return frame_size; | |
| } | |
| static int s302m_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| int *got_frame_ptr, AVPacket *avpkt) | |
| { | |
| S302Context *s = avctx->priv_data; | |
| const uint8_t *buf = avpkt->data; | |
| int buf_size = avpkt->size; | |
| int block_size, ret, channels; | |
| int i; | |
| int non_pcm_data_type = -1; | |
| int frame_size = s302m_parse_frame_header(avctx, buf, buf_size); | |
| if (frame_size < 0) | |
| return frame_size; | |
| buf_size -= AES3_HEADER_LEN; | |
| buf += AES3_HEADER_LEN; | |
| /* get output buffer */ | |
| block_size = (avctx->bits_per_raw_sample + 4) / 4; | |
| channels = avctx->ch_layout.nb_channels; | |
| frame->nb_samples = 2 * (buf_size / block_size) / channels; | |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| return ret; | |
| avctx->bit_rate = 48000 * channels * (avctx->bits_per_raw_sample + 4) + | |
| 32 * 48000 / frame->nb_samples; | |
| buf_size = (frame->nb_samples * channels / 2) * block_size; | |
| if (avctx->bits_per_raw_sample == 24) { | |
| uint32_t *o = (uint32_t *)frame->data[0]; | |
| for (; buf_size > 6; buf_size -= 7) { | |
| *o++ = ((unsigned)ff_reverse[buf[2]] << 24) | | |
| (ff_reverse[buf[1]] << 16) | | |
| (ff_reverse[buf[0]] << 8); | |
| *o++ = ((unsigned)ff_reverse[buf[6] & 0xf0] << 28) | | |
| (ff_reverse[buf[5]] << 20) | | |
| (ff_reverse[buf[4]] << 12) | | |
| (ff_reverse[buf[3] & 0x0f] << 4); | |
| buf += 7; | |
| } | |
| o = (uint32_t *)frame->data[0]; | |
| if (channels == 2) | |
| for (i=0; i<frame->nb_samples * 2 - 6; i+=2) { | |
| if (o[i] || o[i+1] || o[i+2] || o[i+3]) | |
| break; | |
| if (o[i+4] == 0x96F87200U && o[i+5] == 0xA54E1F00) { | |
| non_pcm_data_type = (o[i+6] >> 16) & 0x1F; | |
| break; | |
| } | |
| } | |
| } else if (avctx->bits_per_raw_sample == 20) { | |
| uint32_t *o = (uint32_t *)frame->data[0]; | |
| for (; buf_size > 5; buf_size -= 6) { | |
| *o++ = ((unsigned)ff_reverse[buf[2] & 0xf0] << 28) | | |
| (ff_reverse[buf[1]] << 20) | | |
| (ff_reverse[buf[0]] << 12); | |
| *o++ = ((unsigned)ff_reverse[buf[5] & 0xf0] << 28) | | |
| (ff_reverse[buf[4]] << 20) | | |
| (ff_reverse[buf[3]] << 12); | |
| buf += 6; | |
| } | |
| o = (uint32_t *)frame->data[0]; | |
| if (channels == 2) | |
| for (i=0; i<frame->nb_samples * 2 - 6; i+=2) { | |
| if (o[i] || o[i+1] || o[i+2] || o[i+3]) | |
| break; | |
| if (o[i+4] == 0x6F872000U && o[i+5] == 0x54E1F000) { | |
| non_pcm_data_type = (o[i+6] >> 16) & 0x1F; | |
| break; | |
| } | |
| } | |
| } else { | |
| uint16_t *o = (uint16_t *)frame->data[0]; | |
| for (; buf_size > 4; buf_size -= 5) { | |
| *o++ = (ff_reverse[buf[1]] << 8) | | |
| ff_reverse[buf[0]]; | |
| *o++ = (ff_reverse[buf[4] & 0xf0] << 12) | | |
| (ff_reverse[buf[3]] << 4) | | |
| (ff_reverse[buf[2]] >> 4); | |
| buf += 5; | |
| } | |
| o = (uint16_t *)frame->data[0]; | |
| if (channels == 2) | |
| for (i=0; i<frame->nb_samples * 2 - 6; i+=2) { | |
| if (o[i] || o[i+1] || o[i+2] || o[i+3]) | |
| break; | |
| if (o[i+4] == 0xF872U && o[i+5] == 0x4E1F) { | |
| non_pcm_data_type = (o[i+6] & 0x1F); | |
| break; | |
| } | |
| } | |
| } | |
| if (non_pcm_data_type != -1) { | |
| if (s->non_pcm_mode == 3) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "S302 non PCM mode with data type %d not supported\n", | |
| non_pcm_data_type); | |
| return AVERROR_PATCHWELCOME; | |
| } | |
| if (s->non_pcm_mode & 1) { | |
| return avpkt->size; | |
| } | |
| } | |
| avctx->sample_rate = 48000; | |
| *got_frame_ptr = 1; | |
| return avpkt->size; | |
| } | |
| #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_DECODING_PARAM | |
| static const AVOption s302m_options[] = { | |
| {"non_pcm_mode", "Chooses what to do with NON-PCM", offsetof(S302Context, non_pcm_mode), AV_OPT_TYPE_INT, {.i64 = 3}, 0, 3, FLAGS, .unit = "non_pcm_mode"}, | |
| {"copy" , "Pass NON-PCM through unchanged" , 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 3, FLAGS, .unit = "non_pcm_mode"}, | |
| {"drop" , "Drop NON-PCM" , 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 3, FLAGS, .unit = "non_pcm_mode"}, | |
| {"decode_copy" , "Decode if possible else passthrough", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 3, FLAGS, .unit = "non_pcm_mode"}, | |
| {"decode_drop" , "Decode if possible else drop" , 0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 3, FLAGS, .unit = "non_pcm_mode"}, | |
| {NULL} | |
| }; | |
| static const AVClass s302m_class = { | |
| .class_name = "SMPTE 302M Decoder", | |
| .item_name = av_default_item_name, | |
| .option = s302m_options, | |
| .version = LIBAVUTIL_VERSION_INT, | |
| }; | |
| const FFCodec ff_s302m_decoder = { | |
| .p.name = "s302m", | |
| CODEC_LONG_NAME("SMPTE 302M"), | |
| .p.type = AVMEDIA_TYPE_AUDIO, | |
| .p.id = AV_CODEC_ID_S302M, | |
| .p.priv_class = &s302m_class, | |
| .priv_data_size = sizeof(S302Context), | |
| FF_CODEC_DECODE_CB(s302m_decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | | |
| AV_CODEC_CAP_DR1, | |
| }; |