FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bsf/pcm_rechunk.c
Date: 2024-02-29 09:57:37
Exec Total Coverage
Lines: 76 95 80.0%
Functions: 6 7 85.7%
Branches: 38 54 70.4%

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1 /*
2 * Copyright (c) 2020 Marton Balint
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "bsf.h"
22 #include "bsf_internal.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/opt.h"
25
26 typedef struct PCMContext {
27 const AVClass *class;
28
29 int nb_out_samples;
30 int pad;
31 AVRational frame_rate;
32
33 AVPacket *in_pkt;
34 AVPacket *out_pkt;
35 int sample_size;
36 int64_t n;
37 } PCMContext;
38
39 16 static int init(AVBSFContext *ctx)
40 {
41 16 PCMContext *s = ctx->priv_data;
42 16 AVRational sr = av_make_q(ctx->par_in->sample_rate, 1);
43 int64_t min_samples;
44
45
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16 if (ctx->par_in->ch_layout.nb_channels <= 0 || ctx->par_in->sample_rate <= 0)
46 return AVERROR(EINVAL);
47
48 16 ctx->time_base_out = av_inv_q(sr);
49 32 s->sample_size = ctx->par_in->ch_layout.nb_channels *
50 16 av_get_bits_per_sample(ctx->par_in->codec_id) / 8;
51
52
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16 if (s->frame_rate.num) {
53 13 min_samples = av_rescale_q_rnd(1, sr, s->frame_rate, AV_ROUND_DOWN);
54 } else {
55 3 min_samples = s->nb_out_samples;
56 }
57
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16 if (min_samples <= 0 || min_samples > INT_MAX / s->sample_size - 1)
58 return AVERROR(EINVAL);
59
60 16 s->in_pkt = av_packet_alloc();
61 16 s->out_pkt = av_packet_alloc();
62
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16 if (!s->in_pkt || !s->out_pkt)
63 return AVERROR(ENOMEM);
64
65 16 return 0;
66 }
67
68 16 static void uninit(AVBSFContext *ctx)
69 {
70 16 PCMContext *s = ctx->priv_data;
71 16 av_packet_free(&s->in_pkt);
72 16 av_packet_free(&s->out_pkt);
73 16 }
74
75 static void flush(AVBSFContext *ctx)
76 {
77 PCMContext *s = ctx->priv_data;
78 av_packet_unref(s->in_pkt);
79 av_packet_unref(s->out_pkt);
80 s->n = 0;
81 }
82
83 260 static int send_packet(PCMContext *s, int nb_samples, AVPacket *pkt)
84 {
85 260 pkt->duration = nb_samples;
86 260 s->n++;
87 260 return 0;
88 }
89
90 758 static void drain_packet(AVPacket *pkt, int drain_data, int drain_samples)
91 {
92 758 pkt->size -= drain_data;
93 758 pkt->data += drain_data;
94
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758 if (pkt->dts != AV_NOPTS_VALUE)
95 758 pkt->dts += drain_samples;
96
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758 if (pkt->pts != AV_NOPTS_VALUE)
97 758 pkt->pts += drain_samples;
98 758 }
99
100 838 static int get_next_nb_samples(AVBSFContext *ctx)
101 {
102 838 PCMContext *s = ctx->priv_data;
103
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838 if (s->frame_rate.num) {
104 694 AVRational sr = av_make_q(ctx->par_in->sample_rate, 1);
105 694 return av_rescale_q(s->n + 1, sr, s->frame_rate) - av_rescale_q(s->n, sr, s->frame_rate);
106 } else {
107 144 return s->nb_out_samples;
108 }
109 }
110
111 838 static int rechunk_filter(AVBSFContext *ctx, AVPacket *pkt)
112 {
113 838 PCMContext *s = ctx->priv_data;
114 838 int nb_samples = get_next_nb_samples(ctx);
115 838 int data_size = nb_samples * s->sample_size;
116 int ret;
117
118 do {
119
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1400 if (s->in_pkt->size) {
120
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1297 if (s->out_pkt->size || s->in_pkt->size < data_size) {
121 758 int drain = FFMIN(s->in_pkt->size, data_size - s->out_pkt->size);
122
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758 if (!s->out_pkt->size) {
123 242 ret = av_new_packet(s->out_pkt, data_size);
124
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242 if (ret < 0)
125 return ret;
126 242 ret = av_packet_copy_props(s->out_pkt, s->in_pkt);
127
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242 if (ret < 0) {
128 av_packet_unref(s->out_pkt);
129 return ret;
130 }
131 242 s->out_pkt->size = 0;
132 }
133 758 memcpy(s->out_pkt->data + s->out_pkt->size, s->in_pkt->data, drain);
134 758 s->out_pkt->size += drain;
135 758 drain_packet(s->in_pkt, drain, drain / s->sample_size);
136
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758 if (!s->in_pkt->size)
137 544 av_packet_unref(s->in_pkt);
138
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758 if (s->out_pkt->size == data_size) {
139 237 av_packet_move_ref(pkt, s->out_pkt);
140 237 return send_packet(s, nb_samples, pkt);
141 }
142
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521 av_assert0(!s->in_pkt->size);
143
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18 } else if (s->in_pkt->size > data_size) {
144 ret = av_packet_ref(pkt, s->in_pkt);
145 if (ret < 0)
146 return ret;
147 pkt->size = data_size;
148 drain_packet(s->in_pkt, data_size, nb_samples);
149 return send_packet(s, nb_samples, pkt);
150 } else {
151
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18 av_assert0(s->in_pkt->size == data_size);
152 18 av_packet_move_ref(pkt, s->in_pkt);
153 18 return send_packet(s, nb_samples, pkt);
154 }
155 } else
156 624 av_packet_unref(s->in_pkt);
157
158 1145 ret = ff_bsf_get_packet_ref(ctx, s->in_pkt);
159
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1145 if (ret == AVERROR_EOF && s->out_pkt->size) {
160
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5 if (s->pad) {
161 5 memset(s->out_pkt->data + s->out_pkt->size, 0, data_size - s->out_pkt->size);
162 5 s->out_pkt->size = data_size;
163 } else {
164 nb_samples = s->out_pkt->size / s->sample_size;
165 }
166 5 av_packet_move_ref(pkt, s->out_pkt);
167 5 return send_packet(s, nb_samples, pkt);
168 }
169
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1140 if (ret >= 0)
170 562 av_packet_rescale_ts(s->in_pkt, ctx->time_base_in, ctx->time_base_out);
171
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1140 } while (ret >= 0);
172
173 578 return ret;
174 }
175
176 #define OFFSET(x) offsetof(PCMContext, x)
177 #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_BSF_PARAM)
178 static const AVOption options[] = {
179 { "nb_out_samples", "set the number of per-packet output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
180 { "n", "set the number of per-packet output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS },
181 { "pad", "pad last packet with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1} , 0, 1, FLAGS },
182 { "p", "pad last packet with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1} , 0, 1, FLAGS },
183 { "frame_rate", "set number of packets per second", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS },
184 { "r", "set number of packets per second", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS },
185 { NULL },
186 };
187
188 static const AVClass pcm_rechunk_class = {
189 .class_name = "pcm_rechunk_bsf",
190 .item_name = av_default_item_name,
191 .option = options,
192 .version = LIBAVUTIL_VERSION_INT,
193 };
194
195 static const enum AVCodecID codec_ids[] = {
196 AV_CODEC_ID_PCM_S16LE,
197 AV_CODEC_ID_PCM_S16BE,
198 AV_CODEC_ID_PCM_S8,
199 AV_CODEC_ID_PCM_S32LE,
200 AV_CODEC_ID_PCM_S32BE,
201 AV_CODEC_ID_PCM_S24LE,
202 AV_CODEC_ID_PCM_S24BE,
203 AV_CODEC_ID_PCM_F32BE,
204 AV_CODEC_ID_PCM_F32LE,
205 AV_CODEC_ID_PCM_F64BE,
206 AV_CODEC_ID_PCM_F64LE,
207 AV_CODEC_ID_PCM_S64LE,
208 AV_CODEC_ID_PCM_S64BE,
209 AV_CODEC_ID_PCM_F16LE,
210 AV_CODEC_ID_PCM_F24LE,
211 AV_CODEC_ID_NONE,
212 };
213
214 const FFBitStreamFilter ff_pcm_rechunk_bsf = {
215 .p.name = "pcm_rechunk",
216 .p.codec_ids = codec_ids,
217 .p.priv_class = &pcm_rechunk_class,
218 .priv_data_size = sizeof(PCMContext),
219 .filter = rechunk_filter,
220 .init = init,
221 .flush = flush,
222 .close = uninit,
223 };
224