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1 | /* | ||
2 | * LPCM codecs for PCM formats found in Video DVD streams | ||
3 | * Copyright (c) 2018 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/avassert.h" | ||
23 | #include "libavutil/channel_layout.h" | ||
24 | #include "avcodec.h" | ||
25 | #include "bytestream.h" | ||
26 | #include "codec_internal.h" | ||
27 | #include "encode.h" | ||
28 | |||
29 | typedef struct PCMDVDContext { | ||
30 | uint8_t header[3]; // Header added to every frame | ||
31 | int block_size; // Size of a block of samples in bytes | ||
32 | int samples_per_block; // Number of samples per channel per block | ||
33 | int groups_per_block; // Number of 20/24-bit sample groups per block | ||
34 | } PCMDVDContext; | ||
35 | |||
36 | 10 | static av_cold int pcm_dvd_encode_init(AVCodecContext *avctx) | |
37 | { | ||
38 | 10 | PCMDVDContext *s = avctx->priv_data; | |
39 | int quant, freq, frame_size; | ||
40 | |||
41 |
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10 | switch (avctx->sample_rate) { |
42 | 8 | case 48000: | |
43 | 8 | freq = 0; | |
44 | 8 | break; | |
45 | 2 | case 96000: | |
46 | 2 | freq = 1; | |
47 | 2 | break; | |
48 | ✗ | default: | |
49 | ✗ | av_unreachable("Already checked via CODEC_SAMPLERATES"); | |
50 | } | ||
51 | |||
52 |
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10 | switch (avctx->sample_fmt) { |
53 | 6 | case AV_SAMPLE_FMT_S16: | |
54 | 6 | avctx->bits_per_coded_sample = 16; | |
55 | 6 | quant = 0; | |
56 | 6 | break; | |
57 | 4 | case AV_SAMPLE_FMT_S32: | |
58 | 4 | avctx->bits_per_coded_sample = 24; | |
59 | 4 | quant = 2; | |
60 | 4 | break; | |
61 | ✗ | default: | |
62 | ✗ | av_unreachable("Already checked via CODEC_SAMPLEFMTS"); | |
63 | } | ||
64 | |||
65 | 10 | avctx->bits_per_coded_sample = 16 + quant * 4; | |
66 | 10 | avctx->block_align = avctx->ch_layout.nb_channels * avctx->bits_per_coded_sample / 8; | |
67 | 10 | avctx->bit_rate = avctx->block_align * 8LL * avctx->sample_rate; | |
68 |
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10 | if (avctx->bit_rate > 9800000) { |
69 | ✗ | av_log(avctx, AV_LOG_ERROR, "Too big bitrate: reduce sample rate, bitdepth or channels.\n"); | |
70 | ✗ | return AVERROR(EINVAL); | |
71 | } | ||
72 | |||
73 |
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10 | if (avctx->sample_fmt == AV_SAMPLE_FMT_S16) { |
74 | 6 | s->samples_per_block = 1; | |
75 | 6 | s->block_size = avctx->ch_layout.nb_channels * 2; | |
76 | 6 | frame_size = 2008 / s->block_size; | |
77 | } else { | ||
78 |
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4 | switch (avctx->ch_layout.nb_channels) { |
79 | 2 | case 1: | |
80 | case 2: | ||
81 | case 4: | ||
82 | /* one group has all the samples needed */ | ||
83 | 2 | s->block_size = 4 * avctx->bits_per_coded_sample / 8; | |
84 | 2 | s->samples_per_block = 4 / avctx->ch_layout.nb_channels; | |
85 | 2 | s->groups_per_block = 1; | |
86 | 2 | break; | |
87 | 1 | case 8: | |
88 | /* two groups have all the samples needed */ | ||
89 | 1 | s->block_size = 8 * avctx->bits_per_coded_sample / 8; | |
90 | 1 | s->samples_per_block = 1; | |
91 | 1 | s->groups_per_block = 2; | |
92 | 1 | break; | |
93 | 1 | default: | |
94 | /* need avctx->ch_layout.nb_channels groups */ | ||
95 | 1 | s->block_size = 4 * avctx->ch_layout.nb_channels * | |
96 | 1 | avctx->bits_per_coded_sample / 8; | |
97 | 1 | s->samples_per_block = 4; | |
98 | 1 | s->groups_per_block = avctx->ch_layout.nb_channels; | |
99 | 1 | break; | |
100 | } | ||
101 | |||
102 | 4 | frame_size = FFALIGN(2008 / s->block_size, s->samples_per_block); | |
103 | } | ||
104 | |||
105 | 10 | s->header[0] = 0x0c; | |
106 | 10 | s->header[1] = (quant << 6) | (freq << 4) | (avctx->ch_layout.nb_channels - 1); | |
107 | 10 | s->header[2] = 0x80; | |
108 | |||
109 |
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10 | if (!avctx->frame_size) |
110 | 10 | avctx->frame_size = frame_size; | |
111 | |||
112 | 10 | return 0; | |
113 | } | ||
114 | |||
115 | 15338 | static int pcm_dvd_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, | |
116 | const AVFrame *frame, int *got_packet_ptr) | ||
117 | { | ||
118 | 15338 | PCMDVDContext *s = avctx->priv_data; | |
119 | 15338 | int samples = frame->nb_samples * avctx->ch_layout.nb_channels; | |
120 | 15338 | int64_t pkt_size = (int64_t)(frame->nb_samples / s->samples_per_block) * s->block_size + 3; | |
121 | 15338 | int blocks = (pkt_size - 3) / s->block_size; | |
122 | const int16_t *src16; | ||
123 | const int32_t *src32; | ||
124 | PutByteContext pb; | ||
125 | int ret; | ||
126 | |||
127 |
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15338 | if ((ret = ff_get_encode_buffer(avctx, avpkt, pkt_size, 0)) < 0) |
128 | ✗ | return ret; | |
129 | |||
130 | 15338 | memcpy(avpkt->data, s->header, 3); | |
131 | |||
132 | 15338 | src16 = (const int16_t *)frame->data[0]; | |
133 | 15338 | src32 = (const int32_t *)frame->data[0]; | |
134 | |||
135 | 15338 | bytestream2_init_writer(&pb, avpkt->data + 3, avpkt->size - 3); | |
136 | |||
137 |
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15338 | switch (avctx->sample_fmt) { |
138 | 2202820 | case AV_SAMPLE_FMT_S16: | |
139 | do { | ||
140 | 2202820 | bytestream2_put_be16(&pb, *src16++); | |
141 |
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2202820 | } while (--samples); |
142 | 2198 | break; | |
143 | 13140 | case AV_SAMPLE_FMT_S32: | |
144 |
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13140 | if (avctx->ch_layout.nb_channels == 1) { |
145 | do { | ||
146 |
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25920 | for (int i = 2; i; i--) { |
147 | 17280 | bytestream2_put_be16(&pb, src32[0] >> 16); | |
148 | 17280 | bytestream2_put_be16(&pb, src32[1] >> 16); | |
149 | 17280 | bytestream2_put_byte(&pb, (uint8_t)((*src32++) >> 8)); | |
150 | 17280 | bytestream2_put_byte(&pb, (uint8_t)((*src32++) >> 8)); | |
151 | } | ||
152 |
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8640 | } while (--blocks); |
153 | } else { | ||
154 | do { | ||
155 |
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1598058 | for (int i = s->groups_per_block; i; i--) { |
156 | 886839 | bytestream2_put_be16(&pb, src32[0] >> 16); | |
157 | 886839 | bytestream2_put_be16(&pb, src32[1] >> 16); | |
158 | 886839 | bytestream2_put_be16(&pb, src32[2] >> 16); | |
159 | 886839 | bytestream2_put_be16(&pb, src32[3] >> 16); | |
160 | 886839 | bytestream2_put_byte(&pb, (uint8_t)((*src32++) >> 8)); | |
161 | 886839 | bytestream2_put_byte(&pb, (uint8_t)((*src32++) >> 8)); | |
162 | 886839 | bytestream2_put_byte(&pb, (uint8_t)((*src32++) >> 8)); | |
163 | 886839 | bytestream2_put_byte(&pb, (uint8_t)((*src32++) >> 8)); | |
164 | } | ||
165 |
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711219 | } while (--blocks); |
166 | } | ||
167 | 13140 | break; | |
168 | } | ||
169 | |||
170 | 15338 | *got_packet_ptr = 1; | |
171 | |||
172 | 15338 | return 0; | |
173 | } | ||
174 | |||
175 | const FFCodec ff_pcm_dvd_encoder = { | ||
176 | .p.name = "pcm_dvd", | ||
177 | CODEC_LONG_NAME("PCM signed 16|20|24-bit big-endian for DVD media"), | ||
178 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
179 | .p.id = AV_CODEC_ID_PCM_DVD, | ||
180 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME | | ||
181 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, | ||
182 | .priv_data_size = sizeof(PCMDVDContext), | ||
183 | .init = pcm_dvd_encode_init, | ||
184 | FF_CODEC_ENCODE_CB(pcm_dvd_encode_frame), | ||
185 | CODEC_SAMPLERATES(48000, 96000), | ||
186 | CODEC_CH_LAYOUTS(AV_CHANNEL_LAYOUT_MONO, AV_CHANNEL_LAYOUT_STEREO, | ||
187 | AV_CHANNEL_LAYOUT_5POINT1, AV_CHANNEL_LAYOUT_7POINT1), | ||
188 | CODEC_SAMPLEFMTS(AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32), | ||
189 | }; | ||
190 |