repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Packed Animation File audio decoder | |
| 3 | * Copyright (c) 2012 Paul B Mahol | |
| 4 | * | |
| 5 | * This file is part of FFmpeg. | |
| 6 | * | |
| 7 | * FFmpeg is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU Lesser General Public | |
| 9 | * License as published by the Free Software Foundation; either | |
| 10 | * version 2.1 of the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * FFmpeg is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 15 | * Lesser General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU Lesser General Public | |
| 18 | * License along with FFmpeg; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 20 | */ | |
| 21 | ||
| 22 | #include "libavutil/intreadwrite.h" | |
| 23 | ||
| 24 | #include "avcodec.h" | |
| 25 | #include "internal.h" | |
| 26 | #include "mathops.h" | |
| 27 | #include "paf.h" | |
| 28 | ||
| 29 | static av_cold int paf_audio_init(AVCodecContext *avctx) | |
| 30 | { | |
| 31 | if (avctx->channels != 2) { | |
| 32 | av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); | |
| 33 | return AVERROR_INVALIDDATA; | |
| 34 | } | |
| 35 | ||
| 36 | avctx->channel_layout = AV_CH_LAYOUT_STEREO; | |
| 37 | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
| 38 | ||
| 39 | return 0; | |
| 40 | } | |
| 41 | ||
| 42 | static int paf_audio_decode(AVCodecContext *avctx, void *data, | |
| 43 | int *got_frame, AVPacket *pkt) | |
| 44 | { | |
| 45 | AVFrame *frame = data; | |
| 46 | int16_t *output_samples; | |
| 47 | const uint8_t *src = pkt->data; | |
| 48 | int frames, ret, i, j; | |
| 49 | int16_t cb[256]; | |
| 50 | ||
| 51 | frames = pkt->size / PAF_SOUND_FRAME_SIZE; | |
| 52 | if (frames < 1) | |
| 53 | return AVERROR_INVALIDDATA; | |
| 54 | ||
| 55 | frame->nb_samples = PAF_SOUND_SAMPLES * frames; | |
| 56 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| 57 | return ret; | |
| 58 | ||
| 59 | output_samples = (int16_t *)frame->data[0]; | |
| 60 | // codebook of 256 16-bit samples and 8-bit indices to it | |
| 61 | for (j = 0; j < frames; j++) { | |
| 62 | for (i = 0; i < 256; i++) | |
| 63 | cb[i] = sign_extend(AV_RL16(src + i * 2), 16); | |
| 64 | src += 256 * 2; | |
| 65 | // always 2 channels | |
| 66 | for (i = 0; i < PAF_SOUND_SAMPLES * 2; i++) | |
| 67 | *output_samples++ = cb[*src++]; | |
| 68 | } | |
| 69 | *got_frame = 1; | |
| 70 | ||
| 71 | return pkt->size; | |
| 72 | } | |
| 73 | ||
| 74 | AVCodec ff_paf_audio_decoder = { | |
| 75 | .name = "paf_audio", | |
| 76 | .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"), | |
| 77 | .type = AVMEDIA_TYPE_AUDIO, | |
| 78 | .id = AV_CODEC_ID_PAF_AUDIO, | |
| 79 | .init = paf_audio_init, | |
| 80 | .decode = paf_audio_decode, | |
| 81 | .capabilities = CODEC_CAP_DR1, | |
| 82 | }; |