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1 | /* |
2 | * Xiph CELT decoder using libcelt | |
3 | * Copyright (c) 2011 Nicolas George | |
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 <celt/celt.h> | |
23 | #include <celt/celt_header.h> | |
24 | #include "avcodec.h" | |
25 | #include "internal.h" | |
26 | #include "libavutil/intreadwrite.h" | |
27 | ||
28 | struct libcelt_context { | |
29 | CELTMode *mode; | |
30 | CELTDecoder *dec; | |
31 | int discard; | |
32 | }; | |
33 | ||
34 | static int ff_celt_error_to_averror(int err) | |
35 | { | |
36 | switch (err) { | |
37 | case CELT_BAD_ARG: return AVERROR(EINVAL); | |
38 | #ifdef CELT_BUFFER_TOO_SMALL | |
39 | case CELT_BUFFER_TOO_SMALL: return AVERROR(ENOBUFS); | |
40 | #endif | |
41 | case CELT_INTERNAL_ERROR: return AVERROR(EFAULT); | |
42 | case CELT_CORRUPTED_DATA: return AVERROR_INVALIDDATA; | |
43 | case CELT_UNIMPLEMENTED: return AVERROR(ENOSYS); | |
44 | #ifdef ENOTRECOVERABLE | |
45 | case CELT_INVALID_STATE: return AVERROR(ENOTRECOVERABLE); | |
46 | #endif | |
47 | case CELT_ALLOC_FAIL: return AVERROR(ENOMEM); | |
48 | default: return AVERROR(EINVAL); | |
49 | } | |
50 | } | |
51 | ||
52 | static int ff_celt_bitstream_version_hack(CELTMode *mode) | |
53 | { | |
54 | CELTHeader header = { .version_id = 0 }; | |
55 | celt_header_init(&header, mode, 960, 2); | |
56 | return header.version_id; | |
57 | } | |
58 | ||
59 | static av_cold int libcelt_dec_init(AVCodecContext *c) | |
60 | { | |
61 | struct libcelt_context *celt = c->priv_data; | |
62 | int err; | |
63 | ||
64 | if (!c->channels || !c->frame_size || | |
65 | c->frame_size > INT_MAX / sizeof(int16_t) / c->channels) | |
66 | return AVERROR(EINVAL); | |
67 | celt->mode = celt_mode_create(c->sample_rate, c->frame_size, &err); | |
68 | if (!celt->mode) | |
69 | return ff_celt_error_to_averror(err); | |
70 | celt->dec = celt_decoder_create_custom(celt->mode, c->channels, &err); | |
71 | if (!celt->dec) { | |
72 | celt_mode_destroy(celt->mode); | |
73 | return ff_celt_error_to_averror(err); | |
74 | } | |
75 | if (c->extradata_size >= 4) { | |
76 | celt->discard = AV_RL32(c->extradata); | |
77 | if (celt->discard < 0 || celt->discard >= c->frame_size) { | |
78 | av_log(c, AV_LOG_WARNING, | |
79 | "Invalid overlap (%d), ignored.\n", celt->discard); | |
80 | celt->discard = 0; | |
81 | } | |
82 | } | |
83 | if (c->extradata_size >= 8) { | |
84 | unsigned version = AV_RL32(c->extradata + 4); | |
85 | unsigned lib_version = ff_celt_bitstream_version_hack(celt->mode); | |
86 | if (version != lib_version) | |
87 | av_log(c, AV_LOG_WARNING, | |
88 | "CELT bitstream version 0x%x may be " | |
89 | "improperly decoded by libcelt for version 0x%x.\n", | |
90 | version, lib_version); | |
91 | } | |
92 | c->sample_fmt = AV_SAMPLE_FMT_S16; | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static av_cold int libcelt_dec_close(AVCodecContext *c) | |
97 | { | |
98 | struct libcelt_context *celt = c->priv_data; | |
99 | ||
100 | celt_decoder_destroy(celt->dec); | |
101 | celt_mode_destroy(celt->mode); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int libcelt_dec_decode(AVCodecContext *c, void *data, | |
106 | int *got_frame_ptr, AVPacket *pkt) | |
107 | { | |
108 | struct libcelt_context *celt = c->priv_data; | |
109 | AVFrame *frame = data; | |
110 | int err; | |
111 | int16_t *pcm; | |
112 | ||
113 | frame->nb_samples = c->frame_size; | |
114 | if ((err = ff_get_buffer(c, frame, 0)) < 0) | |
115 | return err; | |
116 | pcm = (int16_t *)frame->data[0]; | |
117 | err = celt_decode(celt->dec, pkt->data, pkt->size, pcm, c->frame_size); | |
118 | if (err < 0) | |
119 | return ff_celt_error_to_averror(err); | |
120 | if (celt->discard) { | |
121 | frame->nb_samples -= celt->discard; | |
122 | memmove(pcm, pcm + celt->discard * c->channels, | |
123 | frame->nb_samples * c->channels * sizeof(int16_t)); | |
124 | celt->discard = 0; | |
125 | } | |
126 | *got_frame_ptr = 1; | |
127 | return pkt->size; | |
128 | } | |
129 | ||
130 | AVCodec ff_libcelt_decoder = { | |
131 | .name = "libcelt", | |
132 | .long_name = NULL_IF_CONFIG_SMALL("Xiph CELT decoder using libcelt"), | |
133 | .type = AVMEDIA_TYPE_AUDIO, | |
134 | .id = AV_CODEC_ID_CELT, | |
135 | .priv_data_size = sizeof(struct libcelt_context), | |
136 | .init = libcelt_dec_init, | |
137 | .close = libcelt_dec_close, | |
138 | .decode = libcelt_dec_decode, | |
139 | .capabilities = CODEC_CAP_DR1, | |
140 | }; |