FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pcm-dvdenc.c
Date: 2022-07-04 19:11:22
Exec Total Coverage
Lines: 0 93 0.0%
Branches: 0 32 0.0%

Line Branch Exec Source
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/channel_layout.h"
23 #include "avcodec.h"
24 #include "bytestream.h"
25 #include "codec_internal.h"
26 #include "encode.h"
27 #include "internal.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 uint8_t *extra_samples; // Pointer to leftover samples from a frame
35 int extra_sample_count; // Number of leftover samples in the buffer
36 } PCMDVDContext;
37
38 static av_cold int pcm_dvd_encode_init(AVCodecContext *avctx)
39 {
40 PCMDVDContext *s = avctx->priv_data;
41 int quant, freq, frame_size;
42
43 switch (avctx->sample_rate) {
44 case 48000:
45 freq = 0;
46 break;
47 case 96000:
48 freq = 1;
49 break;
50 default:
51 av_assert1(0);
52 }
53
54 switch (avctx->sample_fmt) {
55 case AV_SAMPLE_FMT_S16:
56 avctx->bits_per_coded_sample = 16;
57 quant = 0;
58 break;
59 case AV_SAMPLE_FMT_S32:
60 avctx->bits_per_coded_sample = 24;
61 quant = 2;
62 break;
63 default:
64 av_assert1(0);
65 }
66
67 avctx->bits_per_coded_sample = 16 + quant * 4;
68 avctx->block_align = avctx->ch_layout.nb_channels * avctx->bits_per_coded_sample / 8;
69 avctx->bit_rate = avctx->block_align * 8LL * avctx->sample_rate;
70 if (avctx->bit_rate > 9800000) {
71 av_log(avctx, AV_LOG_ERROR, "Too big bitrate: reduce sample rate, bitdepth or channels.\n");
72 return AVERROR(EINVAL);
73 }
74
75 if (avctx->sample_fmt == AV_SAMPLE_FMT_S16) {
76 s->samples_per_block = 1;
77 s->block_size = avctx->ch_layout.nb_channels * 2;
78 frame_size = 2008 / s->block_size;
79 } else {
80 switch (avctx->ch_layout.nb_channels) {
81 case 1:
82 case 2:
83 case 4:
84 /* one group has all the samples needed */
85 s->block_size = 4 * avctx->bits_per_coded_sample / 8;
86 s->samples_per_block = 4 / avctx->ch_layout.nb_channels;
87 s->groups_per_block = 1;
88 break;
89 case 8:
90 /* two groups have all the samples needed */
91 s->block_size = 8 * avctx->bits_per_coded_sample / 8;
92 s->samples_per_block = 1;
93 s->groups_per_block = 2;
94 break;
95 default:
96 /* need avctx->ch_layout.nb_channels groups */
97 s->block_size = 4 * avctx->ch_layout.nb_channels *
98 avctx->bits_per_coded_sample / 8;
99 s->samples_per_block = 4;
100 s->groups_per_block = avctx->ch_layout.nb_channels;
101 break;
102 }
103
104 frame_size = FFALIGN(2008 / s->block_size, s->samples_per_block);
105 }
106
107 s->header[0] = 0x0c;
108 s->header[1] = (quant << 6) | (freq << 4) | (avctx->ch_layout.nb_channels - 1);
109 s->header[2] = 0x80;
110
111 if (!avctx->frame_size)
112 avctx->frame_size = frame_size;
113
114 return 0;
115 }
116
117 static int pcm_dvd_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
118 const AVFrame *frame, int *got_packet_ptr)
119 {
120 PCMDVDContext *s = avctx->priv_data;
121 int samples = frame->nb_samples * avctx->ch_layout.nb_channels;
122 int64_t pkt_size = (frame->nb_samples / s->samples_per_block) * s->block_size + 3;
123 int blocks = (pkt_size - 3) / s->block_size;
124 const int16_t *src16;
125 const int32_t *src32;
126 PutByteContext pb;
127 int ret;
128
129 if ((ret = ff_get_encode_buffer(avctx, avpkt, pkt_size, 0)) < 0)
130 return ret;
131
132 memcpy(avpkt->data, s->header, 3);
133
134 src16 = (const int16_t *)frame->data[0];
135 src32 = (const int32_t *)frame->data[0];
136
137 bytestream2_init_writer(&pb, avpkt->data + 3, avpkt->size - 3);
138
139 switch (avctx->sample_fmt) {
140 case AV_SAMPLE_FMT_S16:
141 do {
142 bytestream2_put_be16(&pb, *src16++);
143 } while (--samples);
144 break;
145 case AV_SAMPLE_FMT_S32:
146 if (avctx->ch_layout.nb_channels == 1) {
147 do {
148 for (int i = 2; i; i--) {
149 bytestream2_put_be16(&pb, src32[0] >> 16);
150 bytestream2_put_be16(&pb, src32[1] >> 16);
151 bytestream2_put_byte(&pb, (*src32++) >> 24);
152 bytestream2_put_byte(&pb, (*src32++) >> 24);
153 }
154 } while (--blocks);
155 } else {
156 do {
157 for (int i = s->groups_per_block; i; i--) {
158 bytestream2_put_be16(&pb, src32[0] >> 16);
159 bytestream2_put_be16(&pb, src32[1] >> 16);
160 bytestream2_put_be16(&pb, src32[2] >> 16);
161 bytestream2_put_be16(&pb, src32[3] >> 16);
162 bytestream2_put_byte(&pb, (*src32++) >> 24);
163 bytestream2_put_byte(&pb, (*src32++) >> 24);
164 bytestream2_put_byte(&pb, (*src32++) >> 24);
165 bytestream2_put_byte(&pb, (*src32++) >> 24);
166 }
167 } while (--blocks);
168 }
169 break;
170 }
171
172 avpkt->pts = frame->pts;
173 avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
174 *got_packet_ptr = 1;
175
176 return 0;
177 }
178
179 const FFCodec ff_pcm_dvd_encoder = {
180 .p.name = "pcm_dvd",
181 .p.long_name = NULL_IF_CONFIG_SMALL("PCM signed 16|20|24-bit big-endian for DVD media"),
182 .p.type = AVMEDIA_TYPE_AUDIO,
183 .p.id = AV_CODEC_ID_PCM_DVD,
184 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SMALL_LAST_FRAME,
185 .priv_data_size = sizeof(PCMDVDContext),
186 .init = pcm_dvd_encode_init,
187 FF_CODEC_ENCODE_CB(pcm_dvd_encode_frame),
188 .p.supported_samplerates = (const int[]) { 48000, 96000, 0},
189 #if FF_API_OLD_CHANNEL_LAYOUT
190 .p.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
191 AV_CH_LAYOUT_STEREO,
192 AV_CH_LAYOUT_5POINT1,
193 AV_CH_LAYOUT_7POINT1,
194 0 },
195 #endif
196 .p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO,
197 AV_CHANNEL_LAYOUT_STEREO,
198 AV_CHANNEL_LAYOUT_5POINT1,
199 AV_CHANNEL_LAYOUT_7POINT1,
200 { 0 } },
201 .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
202 AV_SAMPLE_FMT_S32,
203 AV_SAMPLE_FMT_NONE },
204 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
205 };
206