diff options
Diffstat (limited to 'ffmpeg/libavcodec/s302m.c')
| -rw-r--r-- | ffmpeg/libavcodec/s302m.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/ffmpeg/libavcodec/s302m.c b/ffmpeg/libavcodec/s302m.c deleted file mode 100644 index 7639a0f..0000000 --- a/ffmpeg/libavcodec/s302m.c +++ /dev/null @@ -1,161 +0,0 @@ -/* - * 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/intreadwrite.h" -#include "libavutil/log.h" -#include "avcodec.h" -#include "internal.h" -#include "mathops.h" - -#define AES3_HEADER_LEN 4 - -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; - - avctx->channels = channels; - switch(channels) { - case 2: - avctx->channel_layout = AV_CH_LAYOUT_STEREO; - break; - case 4: - avctx->channel_layout = AV_CH_LAYOUT_QUAD; - break; - case 6: - avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK; - break; - case 8: - avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX; - } - avctx->sample_rate = 48000; - avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_raw_sample + 4) + - 32 * (48000 / (buf_size * 8 / - (avctx->channels * - (avctx->bits_per_raw_sample + 4)))); - - return frame_size; -} - -static int s302m_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - int block_size, ret; - - 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; - frame->nb_samples = 2 * (buf_size / block_size) / avctx->channels; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - - buf_size = (frame->nb_samples * avctx->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++ = (ff_reverse[buf[2]] << 24) | - (ff_reverse[buf[1]] << 16) | - (ff_reverse[buf[0]] << 8); - *o++ = (ff_reverse[buf[6] & 0xf0] << 28) | - (ff_reverse[buf[5]] << 20) | - (ff_reverse[buf[4]] << 12) | - (ff_reverse[buf[3] & 0x0f] << 4); - buf += 7; - } - } else if (avctx->bits_per_raw_sample == 20) { - uint32_t *o = (uint32_t *)frame->data[0]; - for (; buf_size > 5; buf_size -= 6) { - *o++ = (ff_reverse[buf[2] & 0xf0] << 28) | - (ff_reverse[buf[1]] << 20) | - (ff_reverse[buf[0]] << 12); - *o++ = (ff_reverse[buf[5] & 0xf0] << 28) | - (ff_reverse[buf[4]] << 20) | - (ff_reverse[buf[3]] << 12); - buf += 6; - } - } 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; - } - } - - *got_frame_ptr = 1; - - return avpkt->size; -} - -AVCodec ff_s302m_decoder = { - .name = "s302m", - .long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_S302M, - .decode = s302m_decode_frame, - .capabilities = CODEC_CAP_DR1, -}; |