Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/roqaudioenc.c |
Date: | 2022-07-04 00:18:54 |
Exec | Total | Coverage | |
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Lines: | 74 | 84 | 88.1% |
Branches: | 34 | 46 | 73.9% |
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1 | /* | ||
2 | * RoQ audio encoder | ||
3 | * | ||
4 | * Copyright (c) 2005 Eric Lasota | ||
5 | * Based on RoQ specs (c)2001 Tim Ferguson | ||
6 | * | ||
7 | * This file is part of FFmpeg. | ||
8 | * | ||
9 | * FFmpeg is free software; you can redistribute it and/or | ||
10 | * modify it under the terms of the GNU Lesser General Public | ||
11 | * License as published by the Free Software Foundation; either | ||
12 | * version 2.1 of the License, or (at your option) any later version. | ||
13 | * | ||
14 | * FFmpeg is distributed in the hope that it will be useful, | ||
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
17 | * Lesser General Public License for more details. | ||
18 | * | ||
19 | * You should have received a copy of the GNU Lesser General Public | ||
20 | * License along with FFmpeg; if not, write to the Free Software | ||
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
22 | */ | ||
23 | |||
24 | #include "avcodec.h" | ||
25 | #include "bytestream.h" | ||
26 | #include "codec_internal.h" | ||
27 | #include "encode.h" | ||
28 | #include "mathops.h" | ||
29 | |||
30 | #define ROQ_FRAME_SIZE 735 | ||
31 | #define ROQ_HEADER_SIZE 8 | ||
32 | |||
33 | #define MAX_DPCM (127*127) | ||
34 | |||
35 | |||
36 | typedef struct ROQDPCMContext { | ||
37 | short lastSample[2]; | ||
38 | int input_frames; | ||
39 | int buffered_samples; | ||
40 | int16_t *frame_buffer; | ||
41 | int64_t first_pts; | ||
42 | } ROQDPCMContext; | ||
43 | |||
44 | |||
45 | 1 | static av_cold int roq_dpcm_encode_close(AVCodecContext *avctx) | |
46 | { | ||
47 | 1 | ROQDPCMContext *context = avctx->priv_data; | |
48 | |||
49 | 1 | av_freep(&context->frame_buffer); | |
50 | |||
51 | 1 | return 0; | |
52 | } | ||
53 | |||
54 | 1 | static av_cold int roq_dpcm_encode_init(AVCodecContext *avctx) | |
55 | { | ||
56 | 1 | ROQDPCMContext *context = avctx->priv_data; | |
57 | 1 | int channels = avctx->ch_layout.nb_channels; | |
58 | |||
59 |
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1 | if (channels > 2) { |
60 | ✗ | av_log(avctx, AV_LOG_ERROR, "Audio must be mono or stereo\n"); | |
61 | ✗ | return AVERROR(EINVAL); | |
62 | } | ||
63 |
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1 | if (avctx->sample_rate != 22050) { |
64 | ✗ | av_log(avctx, AV_LOG_ERROR, "Audio must be 22050 Hz\n"); | |
65 | ✗ | return AVERROR(EINVAL); | |
66 | } | ||
67 | |||
68 | 1 | avctx->frame_size = ROQ_FRAME_SIZE; | |
69 | 1 | avctx->bit_rate = (ROQ_HEADER_SIZE + ROQ_FRAME_SIZE * channels) * | |
70 | 1 | (22050 / ROQ_FRAME_SIZE) * 8; | |
71 | |||
72 | 1 | context->frame_buffer = av_malloc(8 * ROQ_FRAME_SIZE * channels * | |
73 | sizeof(*context->frame_buffer)); | ||
74 |
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1 | if (!context->frame_buffer) |
75 | ✗ | return AVERROR(ENOMEM); | |
76 | |||
77 | 1 | context->lastSample[0] = context->lastSample[1] = 0; | |
78 | |||
79 | 1 | return 0; | |
80 | } | ||
81 | |||
82 | 264600 | static unsigned char dpcm_predict(short *previous, short current) | |
83 | { | ||
84 | int diff; | ||
85 | int negative; | ||
86 | int result; | ||
87 | int predicted; | ||
88 | |||
89 | 264600 | diff = current - *previous; | |
90 | |||
91 | 264600 | negative = diff<0; | |
92 | 264600 | diff = FFABS(diff); | |
93 | |||
94 |
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264600 | if (diff >= MAX_DPCM) |
95 | 10896 | result = 127; | |
96 | else { | ||
97 | 253704 | result = ff_sqrt(diff); | |
98 | 253704 | result += diff > result*result+result; | |
99 | } | ||
100 | |||
101 | /* See if this overflows */ | ||
102 | 264600 | retry: | |
103 | 264600 | diff = result*result; | |
104 |
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264600 | if (negative) |
105 | 131603 | diff = -diff; | |
106 | 264600 | predicted = *previous + diff; | |
107 | |||
108 | /* If it overflows, back off a step */ | ||
109 |
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264600 | if (predicted > 32767 || predicted < -32768) { |
110 | ✗ | result--; | |
111 | ✗ | goto retry; | |
112 | } | ||
113 | |||
114 | /* Add the sign bit */ | ||
115 | 264600 | result |= negative << 7; //if (negative) result |= 128; | |
116 | |||
117 | 264600 | *previous = predicted; | |
118 | |||
119 | 264600 | return result; | |
120 | } | ||
121 | |||
122 | 181 | static int roq_dpcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, | |
123 | const AVFrame *frame, int *got_packet_ptr) | ||
124 | { | ||
125 | int i, stereo, data_size, ret; | ||
126 |
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181 | const int16_t *in = frame ? (const int16_t *)frame->data[0] : NULL; |
127 | 181 | int channels = avctx->ch_layout.nb_channels; | |
128 | uint8_t *out; | ||
129 | 181 | ROQDPCMContext *context = avctx->priv_data; | |
130 | |||
131 | 181 | stereo = (channels == 2); | |
132 | |||
133 |
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181 | if (!in && context->input_frames >= 8) |
134 | 1 | return 0; | |
135 | |||
136 |
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180 | if (in && context->input_frames < 8) { |
137 | 8 | memcpy(&context->frame_buffer[context->buffered_samples * channels], | |
138 | 8 | in, avctx->frame_size * channels * sizeof(*in)); | |
139 | 8 | context->buffered_samples += avctx->frame_size; | |
140 |
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8 | if (context->input_frames == 0) |
141 | 1 | context->first_pts = frame->pts; | |
142 |
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8 | if (context->input_frames < 7) { |
143 | 7 | context->input_frames++; | |
144 | 7 | return 0; | |
145 | } | ||
146 | } | ||
147 |
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173 | if (context->input_frames < 8) |
148 | 1 | in = context->frame_buffer; | |
149 | |||
150 |
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173 | if (stereo) { |
151 | 173 | context->lastSample[0] &= 0xFF00; | |
152 | 173 | context->lastSample[1] &= 0xFF00; | |
153 | } | ||
154 | |||
155 |
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173 | if (context->input_frames == 7) |
156 | 1 | data_size = channels * context->buffered_samples; | |
157 | else | ||
158 | 172 | data_size = channels * avctx->frame_size; | |
159 | |||
160 | 173 | ret = ff_get_encode_buffer(avctx, avpkt, ROQ_HEADER_SIZE + data_size, 0); | |
161 |
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173 | if (ret < 0) |
162 | ✗ | return ret; | |
163 | 173 | out = avpkt->data; | |
164 | |||
165 |
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173 | bytestream_put_byte(&out, stereo ? 0x21 : 0x20); |
166 | 173 | bytestream_put_byte(&out, 0x10); | |
167 | 173 | bytestream_put_le32(&out, data_size); | |
168 | |||
169 |
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173 | if (stereo) { |
170 | 173 | bytestream_put_byte(&out, (context->lastSample[1])>>8); | |
171 | 173 | bytestream_put_byte(&out, (context->lastSample[0])>>8); | |
172 | } else | ||
173 | ✗ | bytestream_put_le16(&out, context->lastSample[0]); | |
174 | |||
175 | /* Write the actual samples */ | ||
176 |
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264773 | for (i = 0; i < data_size; i++) |
177 | 264600 | *out++ = dpcm_predict(&context->lastSample[i & 1], *in++); | |
178 | |||
179 |
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173 | avpkt->pts = context->input_frames <= 7 ? context->first_pts : frame->pts; |
180 | 173 | avpkt->duration = data_size / channels; | |
181 | |||
182 | 173 | context->input_frames++; | |
183 |
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173 | if (!in) |
184 | ✗ | context->input_frames = FFMAX(context->input_frames, 8); | |
185 | |||
186 | 173 | *got_packet_ptr = 1; | |
187 | 173 | return 0; | |
188 | } | ||
189 | |||
190 | const FFCodec ff_roq_dpcm_encoder = { | ||
191 | .p.name = "roq_dpcm", | ||
192 | .p.long_name = NULL_IF_CONFIG_SMALL("id RoQ DPCM"), | ||
193 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
194 | .p.id = AV_CODEC_ID_ROQ_DPCM, | ||
195 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY, | ||
196 | .priv_data_size = sizeof(ROQDPCMContext), | ||
197 | .init = roq_dpcm_encode_init, | ||
198 | FF_CODEC_ENCODE_CB(roq_dpcm_encode_frame), | ||
199 | .close = roq_dpcm_encode_close, | ||
200 | .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, | ||
201 | AV_SAMPLE_FMT_NONE }, | ||
202 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, | ||
203 | }; | ||
204 |