| 1 | /* |
| 2 | * Copyright (c) 2011 Stefano Sabatini |
| 3 | * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> |
| 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 | /** |
| 23 | * @file |
| 24 | * audio volume filter |
| 25 | */ |
| 26 | |
| 27 | #include "libavutil/channel_layout.h" |
| 28 | #include "libavutil/common.h" |
| 29 | #include "libavutil/eval.h" |
| 30 | #include "libavutil/float_dsp.h" |
| 31 | #include "libavutil/intreadwrite.h" |
| 32 | #include "libavutil/opt.h" |
| 33 | #include "libavutil/replaygain.h" |
| 34 | |
| 35 | #include "audio.h" |
| 36 | #include "avfilter.h" |
| 37 | #include "formats.h" |
| 38 | #include "internal.h" |
| 39 | #include "af_volume.h" |
| 40 | |
| 41 | static const char * const precision_str[] = { |
| 42 | "fixed", "float", "double" |
| 43 | }; |
| 44 | |
| 45 | static const char *const var_names[] = { |
| 46 | "n", ///< frame number (starting at zero) |
| 47 | "nb_channels", ///< number of channels |
| 48 | "nb_consumed_samples", ///< number of samples consumed by the filter |
| 49 | "nb_samples", ///< number of samples in the current frame |
| 50 | "pos", ///< position in the file of the frame |
| 51 | "pts", ///< frame presentation timestamp |
| 52 | "sample_rate", ///< sample rate |
| 53 | "startpts", ///< PTS at start of stream |
| 54 | "startt", ///< time at start of stream |
| 55 | "t", ///< time in the file of the frame |
| 56 | "tb", ///< timebase |
| 57 | "volume", ///< last set value |
| 58 | NULL |
| 59 | }; |
| 60 | |
| 61 | #define OFFSET(x) offsetof(VolumeContext, x) |
| 62 | #define A AV_OPT_FLAG_AUDIO_PARAM |
| 63 | #define F AV_OPT_FLAG_FILTERING_PARAM |
| 64 | |
| 65 | static const AVOption volume_options[] = { |
| 66 | { "volume", "set volume adjustment expression", |
| 67 | OFFSET(volume_expr), AV_OPT_TYPE_STRING, { .str = "1.0" }, .flags = A|F }, |
| 68 | { "precision", "select mathematical precision", |
| 69 | OFFSET(precision), AV_OPT_TYPE_INT, { .i64 = PRECISION_FLOAT }, PRECISION_FIXED, PRECISION_DOUBLE, A|F, "precision" }, |
| 70 | { "fixed", "select 8-bit fixed-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FIXED }, INT_MIN, INT_MAX, A|F, "precision" }, |
| 71 | { "float", "select 32-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FLOAT }, INT_MIN, INT_MAX, A|F, "precision" }, |
| 72 | { "double", "select 64-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_DOUBLE }, INT_MIN, INT_MAX, A|F, "precision" }, |
| 73 | { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_ONCE}, 0, EVAL_MODE_NB-1, .flags = A|F, "eval" }, |
| 74 | { "once", "eval volume expression once", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_ONCE}, .flags = A|F, .unit = "eval" }, |
| 75 | { "frame", "eval volume expression per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = A|F, .unit = "eval" }, |
| 76 | { "replaygain", "Apply replaygain side data when present", |
| 77 | OFFSET(replaygain), AV_OPT_TYPE_INT, { .i64 = REPLAYGAIN_DROP }, REPLAYGAIN_DROP, REPLAYGAIN_ALBUM, A, "replaygain" }, |
| 78 | { "drop", "replaygain side data is dropped", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_DROP }, 0, 0, A, "replaygain" }, |
| 79 | { "ignore", "replaygain side data is ignored", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_IGNORE }, 0, 0, A, "replaygain" }, |
| 80 | { "track", "track gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK }, 0, 0, A, "replaygain" }, |
| 81 | { "album", "album gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_ALBUM }, 0, 0, A, "replaygain" }, |
| 82 | { "replaygain_preamp", "Apply replaygain pre-amplification", |
| 83 | OFFSET(replaygain_preamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, -15.0, 15.0, A }, |
| 84 | { "replaygain_noclip", "Apply replaygain clipping prevention", |
| 85 | OFFSET(replaygain_noclip), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, A }, |
| 86 | { NULL }, |
| 87 | }; |
| 88 | |
| 89 | AVFILTER_DEFINE_CLASS(volume); |
| 90 | |
| 91 | static int set_expr(AVExpr **pexpr, const char *expr, void *log_ctx) |
| 92 | { |
| 93 | int ret; |
| 94 | AVExpr *old = NULL; |
| 95 | |
| 96 | if (*pexpr) |
| 97 | old = *pexpr; |
| 98 | ret = av_expr_parse(pexpr, expr, var_names, |
| 99 | NULL, NULL, NULL, NULL, 0, log_ctx); |
| 100 | if (ret < 0) { |
| 101 | av_log(log_ctx, AV_LOG_ERROR, |
| 102 | "Error when evaluating the volume expression '%s'\n", expr); |
| 103 | *pexpr = old; |
| 104 | return ret; |
| 105 | } |
| 106 | |
| 107 | av_expr_free(old); |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | static av_cold int init(AVFilterContext *ctx) |
| 112 | { |
| 113 | VolumeContext *vol = ctx->priv; |
| 114 | return set_expr(&vol->volume_pexpr, vol->volume_expr, ctx); |
| 115 | } |
| 116 | |
| 117 | static av_cold void uninit(AVFilterContext *ctx) |
| 118 | { |
| 119 | VolumeContext *vol = ctx->priv; |
| 120 | av_expr_free(vol->volume_pexpr); |
| 121 | av_opt_free(vol); |
| 122 | } |
| 123 | |
| 124 | static int query_formats(AVFilterContext *ctx) |
| 125 | { |
| 126 | VolumeContext *vol = ctx->priv; |
| 127 | AVFilterFormats *formats = NULL; |
| 128 | AVFilterChannelLayouts *layouts; |
| 129 | static const enum AVSampleFormat sample_fmts[][7] = { |
| 130 | [PRECISION_FIXED] = { |
| 131 | AV_SAMPLE_FMT_U8, |
| 132 | AV_SAMPLE_FMT_U8P, |
| 133 | AV_SAMPLE_FMT_S16, |
| 134 | AV_SAMPLE_FMT_S16P, |
| 135 | AV_SAMPLE_FMT_S32, |
| 136 | AV_SAMPLE_FMT_S32P, |
| 137 | AV_SAMPLE_FMT_NONE |
| 138 | }, |
| 139 | [PRECISION_FLOAT] = { |
| 140 | AV_SAMPLE_FMT_FLT, |
| 141 | AV_SAMPLE_FMT_FLTP, |
| 142 | AV_SAMPLE_FMT_NONE |
| 143 | }, |
| 144 | [PRECISION_DOUBLE] = { |
| 145 | AV_SAMPLE_FMT_DBL, |
| 146 | AV_SAMPLE_FMT_DBLP, |
| 147 | AV_SAMPLE_FMT_NONE |
| 148 | } |
| 149 | }; |
| 150 | |
| 151 | layouts = ff_all_channel_counts(); |
| 152 | if (!layouts) |
| 153 | return AVERROR(ENOMEM); |
| 154 | ff_set_common_channel_layouts(ctx, layouts); |
| 155 | |
| 156 | formats = ff_make_format_list(sample_fmts[vol->precision]); |
| 157 | if (!formats) |
| 158 | return AVERROR(ENOMEM); |
| 159 | ff_set_common_formats(ctx, formats); |
| 160 | |
| 161 | formats = ff_all_samplerates(); |
| 162 | if (!formats) |
| 163 | return AVERROR(ENOMEM); |
| 164 | ff_set_common_samplerates(ctx, formats); |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static inline void scale_samples_u8(uint8_t *dst, const uint8_t *src, |
| 170 | int nb_samples, int volume) |
| 171 | { |
| 172 | int i; |
| 173 | for (i = 0; i < nb_samples; i++) |
| 174 | dst[i] = av_clip_uint8(((((int64_t)src[i] - 128) * volume + 128) >> 8) + 128); |
| 175 | } |
| 176 | |
| 177 | static inline void scale_samples_u8_small(uint8_t *dst, const uint8_t *src, |
| 178 | int nb_samples, int volume) |
| 179 | { |
| 180 | int i; |
| 181 | for (i = 0; i < nb_samples; i++) |
| 182 | dst[i] = av_clip_uint8((((src[i] - 128) * volume + 128) >> 8) + 128); |
| 183 | } |
| 184 | |
| 185 | static inline void scale_samples_s16(uint8_t *dst, const uint8_t *src, |
| 186 | int nb_samples, int volume) |
| 187 | { |
| 188 | int i; |
| 189 | int16_t *smp_dst = (int16_t *)dst; |
| 190 | const int16_t *smp_src = (const int16_t *)src; |
| 191 | for (i = 0; i < nb_samples; i++) |
| 192 | smp_dst[i] = av_clip_int16(((int64_t)smp_src[i] * volume + 128) >> 8); |
| 193 | } |
| 194 | |
| 195 | static inline void scale_samples_s16_small(uint8_t *dst, const uint8_t *src, |
| 196 | int nb_samples, int volume) |
| 197 | { |
| 198 | int i; |
| 199 | int16_t *smp_dst = (int16_t *)dst; |
| 200 | const int16_t *smp_src = (const int16_t *)src; |
| 201 | for (i = 0; i < nb_samples; i++) |
| 202 | smp_dst[i] = av_clip_int16((smp_src[i] * volume + 128) >> 8); |
| 203 | } |
| 204 | |
| 205 | static inline void scale_samples_s32(uint8_t *dst, const uint8_t *src, |
| 206 | int nb_samples, int volume) |
| 207 | { |
| 208 | int i; |
| 209 | int32_t *smp_dst = (int32_t *)dst; |
| 210 | const int32_t *smp_src = (const int32_t *)src; |
| 211 | for (i = 0; i < nb_samples; i++) |
| 212 | smp_dst[i] = av_clipl_int32((((int64_t)smp_src[i] * volume + 128) >> 8)); |
| 213 | } |
| 214 | |
| 215 | static av_cold void volume_init(VolumeContext *vol) |
| 216 | { |
| 217 | vol->samples_align = 1; |
| 218 | |
| 219 | switch (av_get_packed_sample_fmt(vol->sample_fmt)) { |
| 220 | case AV_SAMPLE_FMT_U8: |
| 221 | if (vol->volume_i < 0x1000000) |
| 222 | vol->scale_samples = scale_samples_u8_small; |
| 223 | else |
| 224 | vol->scale_samples = scale_samples_u8; |
| 225 | break; |
| 226 | case AV_SAMPLE_FMT_S16: |
| 227 | if (vol->volume_i < 0x10000) |
| 228 | vol->scale_samples = scale_samples_s16_small; |
| 229 | else |
| 230 | vol->scale_samples = scale_samples_s16; |
| 231 | break; |
| 232 | case AV_SAMPLE_FMT_S32: |
| 233 | vol->scale_samples = scale_samples_s32; |
| 234 | break; |
| 235 | case AV_SAMPLE_FMT_FLT: |
| 236 | avpriv_float_dsp_init(&vol->fdsp, 0); |
| 237 | vol->samples_align = 4; |
| 238 | break; |
| 239 | case AV_SAMPLE_FMT_DBL: |
| 240 | avpriv_float_dsp_init(&vol->fdsp, 0); |
| 241 | vol->samples_align = 8; |
| 242 | break; |
| 243 | } |
| 244 | |
| 245 | if (ARCH_X86) |
| 246 | ff_volume_init_x86(vol); |
| 247 | } |
| 248 | |
| 249 | static int set_volume(AVFilterContext *ctx) |
| 250 | { |
| 251 | VolumeContext *vol = ctx->priv; |
| 252 | |
| 253 | vol->volume = av_expr_eval(vol->volume_pexpr, vol->var_values, NULL); |
| 254 | if (isnan(vol->volume)) { |
| 255 | if (vol->eval_mode == EVAL_MODE_ONCE) { |
| 256 | av_log(ctx, AV_LOG_ERROR, "Invalid value NaN for volume\n"); |
| 257 | return AVERROR(EINVAL); |
| 258 | } else { |
| 259 | av_log(ctx, AV_LOG_WARNING, "Invalid value NaN for volume, setting to 0\n"); |
| 260 | vol->volume = 0; |
| 261 | } |
| 262 | } |
| 263 | vol->var_values[VAR_VOLUME] = vol->volume; |
| 264 | |
| 265 | av_log(ctx, AV_LOG_VERBOSE, "n:%f t:%f pts:%f precision:%s ", |
| 266 | vol->var_values[VAR_N], vol->var_values[VAR_T], vol->var_values[VAR_PTS], |
| 267 | precision_str[vol->precision]); |
| 268 | |
| 269 | if (vol->precision == PRECISION_FIXED) { |
| 270 | vol->volume_i = (int)(vol->volume * 256 + 0.5); |
| 271 | vol->volume = vol->volume_i / 256.0; |
| 272 | av_log(ctx, AV_LOG_VERBOSE, "volume_i:%d/255 ", vol->volume_i); |
| 273 | } |
| 274 | av_log(ctx, AV_LOG_VERBOSE, "volume:%f volume_dB:%f\n", |
| 275 | vol->volume, 20.0*log(vol->volume)/M_LN10); |
| 276 | |
| 277 | volume_init(vol); |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | static int config_output(AVFilterLink *outlink) |
| 282 | { |
| 283 | AVFilterContext *ctx = outlink->src; |
| 284 | VolumeContext *vol = ctx->priv; |
| 285 | AVFilterLink *inlink = ctx->inputs[0]; |
| 286 | |
| 287 | vol->sample_fmt = inlink->format; |
| 288 | vol->channels = inlink->channels; |
| 289 | vol->planes = av_sample_fmt_is_planar(inlink->format) ? vol->channels : 1; |
| 290 | |
| 291 | vol->var_values[VAR_N] = |
| 292 | vol->var_values[VAR_NB_CONSUMED_SAMPLES] = |
| 293 | vol->var_values[VAR_NB_SAMPLES] = |
| 294 | vol->var_values[VAR_POS] = |
| 295 | vol->var_values[VAR_PTS] = |
| 296 | vol->var_values[VAR_STARTPTS] = |
| 297 | vol->var_values[VAR_STARTT] = |
| 298 | vol->var_values[VAR_T] = |
| 299 | vol->var_values[VAR_VOLUME] = NAN; |
| 300 | |
| 301 | vol->var_values[VAR_NB_CHANNELS] = inlink->channels; |
| 302 | vol->var_values[VAR_TB] = av_q2d(inlink->time_base); |
| 303 | vol->var_values[VAR_SAMPLE_RATE] = inlink->sample_rate; |
| 304 | |
| 305 | av_log(inlink->src, AV_LOG_VERBOSE, "tb:%f sample_rate:%f nb_channels:%f\n", |
| 306 | vol->var_values[VAR_TB], |
| 307 | vol->var_values[VAR_SAMPLE_RATE], |
| 308 | vol->var_values[VAR_NB_CHANNELS]); |
| 309 | |
| 310 | return set_volume(ctx); |
| 311 | } |
| 312 | |
| 313 | static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
| 314 | char *res, int res_len, int flags) |
| 315 | { |
| 316 | VolumeContext *vol = ctx->priv; |
| 317 | int ret = AVERROR(ENOSYS); |
| 318 | |
| 319 | if (!strcmp(cmd, "volume")) { |
| 320 | if ((ret = set_expr(&vol->volume_pexpr, args, ctx)) < 0) |
| 321 | return ret; |
| 322 | if (vol->eval_mode == EVAL_MODE_ONCE) |
| 323 | set_volume(ctx); |
| 324 | } |
| 325 | |
| 326 | return ret; |
| 327 | } |
| 328 | |
| 329 | #define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d)) |
| 330 | #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) |
| 331 | #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)*av_q2d(tb)) |
| 332 | |
| 333 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
| 334 | { |
| 335 | AVFilterContext *ctx = inlink->dst; |
| 336 | VolumeContext *vol = inlink->dst->priv; |
| 337 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
| 338 | int nb_samples = buf->nb_samples; |
| 339 | AVFrame *out_buf; |
| 340 | int64_t pos; |
| 341 | AVFrameSideData *sd = av_frame_get_side_data(buf, AV_FRAME_DATA_REPLAYGAIN); |
| 342 | int ret; |
| 343 | |
| 344 | if (sd && vol->replaygain != REPLAYGAIN_IGNORE) { |
| 345 | if (vol->replaygain != REPLAYGAIN_DROP) { |
| 346 | AVReplayGain *replaygain = (AVReplayGain*)sd->data; |
| 347 | int32_t gain = 100000; |
| 348 | uint32_t peak = 100000; |
| 349 | float g, p; |
| 350 | |
| 351 | if (vol->replaygain == REPLAYGAIN_TRACK && |
| 352 | replaygain->track_gain != INT32_MIN) { |
| 353 | gain = replaygain->track_gain; |
| 354 | |
| 355 | if (replaygain->track_peak != 0) |
| 356 | peak = replaygain->track_peak; |
| 357 | } else if (replaygain->album_gain != INT32_MIN) { |
| 358 | gain = replaygain->album_gain; |
| 359 | |
| 360 | if (replaygain->album_peak != 0) |
| 361 | peak = replaygain->album_peak; |
| 362 | } else { |
| 363 | av_log(inlink->dst, AV_LOG_WARNING, "Both ReplayGain gain " |
| 364 | "values are unknown.\n"); |
| 365 | } |
| 366 | g = gain / 100000.0f; |
| 367 | p = peak / 100000.0f; |
| 368 | |
| 369 | av_log(inlink->dst, AV_LOG_VERBOSE, |
| 370 | "Using gain %f dB from replaygain side data.\n", g); |
| 371 | |
| 372 | vol->volume = pow(10, (g + vol->replaygain_preamp) / 20); |
| 373 | if (vol->replaygain_noclip) |
| 374 | vol->volume = FFMIN(vol->volume, 1.0 / p); |
| 375 | vol->volume_i = (int)(vol->volume * 256 + 0.5); |
| 376 | |
| 377 | volume_init(vol); |
| 378 | } |
| 379 | av_frame_remove_side_data(buf, AV_FRAME_DATA_REPLAYGAIN); |
| 380 | } |
| 381 | |
| 382 | if (isnan(vol->var_values[VAR_STARTPTS])) { |
| 383 | vol->var_values[VAR_STARTPTS] = TS2D(buf->pts); |
| 384 | vol->var_values[VAR_STARTT ] = TS2T(buf->pts, inlink->time_base); |
| 385 | } |
| 386 | vol->var_values[VAR_PTS] = TS2D(buf->pts); |
| 387 | vol->var_values[VAR_T ] = TS2T(buf->pts, inlink->time_base); |
| 388 | vol->var_values[VAR_N ] = inlink->frame_count; |
| 389 | |
| 390 | pos = av_frame_get_pkt_pos(buf); |
| 391 | vol->var_values[VAR_POS] = pos == -1 ? NAN : pos; |
| 392 | if (vol->eval_mode == EVAL_MODE_FRAME) |
| 393 | set_volume(ctx); |
| 394 | |
| 395 | if (vol->volume == 1.0 || vol->volume_i == 256) { |
| 396 | out_buf = buf; |
| 397 | goto end; |
| 398 | } |
| 399 | |
| 400 | /* do volume scaling in-place if input buffer is writable */ |
| 401 | if (av_frame_is_writable(buf)) { |
| 402 | out_buf = buf; |
| 403 | } else { |
| 404 | out_buf = ff_get_audio_buffer(inlink, nb_samples); |
| 405 | if (!out_buf) |
| 406 | return AVERROR(ENOMEM); |
| 407 | ret = av_frame_copy_props(out_buf, buf); |
| 408 | if (ret < 0) { |
| 409 | av_frame_free(&out_buf); |
| 410 | av_frame_free(&buf); |
| 411 | return ret; |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | if (vol->precision != PRECISION_FIXED || vol->volume_i > 0) { |
| 416 | int p, plane_samples; |
| 417 | |
| 418 | if (av_sample_fmt_is_planar(buf->format)) |
| 419 | plane_samples = FFALIGN(nb_samples, vol->samples_align); |
| 420 | else |
| 421 | plane_samples = FFALIGN(nb_samples * vol->channels, vol->samples_align); |
| 422 | |
| 423 | if (vol->precision == PRECISION_FIXED) { |
| 424 | for (p = 0; p < vol->planes; p++) { |
| 425 | vol->scale_samples(out_buf->extended_data[p], |
| 426 | buf->extended_data[p], plane_samples, |
| 427 | vol->volume_i); |
| 428 | } |
| 429 | } else if (av_get_packed_sample_fmt(vol->sample_fmt) == AV_SAMPLE_FMT_FLT) { |
| 430 | for (p = 0; p < vol->planes; p++) { |
| 431 | vol->fdsp.vector_fmul_scalar((float *)out_buf->extended_data[p], |
| 432 | (const float *)buf->extended_data[p], |
| 433 | vol->volume, plane_samples); |
| 434 | } |
| 435 | } else { |
| 436 | for (p = 0; p < vol->planes; p++) { |
| 437 | vol->fdsp.vector_dmul_scalar((double *)out_buf->extended_data[p], |
| 438 | (const double *)buf->extended_data[p], |
| 439 | vol->volume, plane_samples); |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | emms_c(); |
| 445 | |
| 446 | if (buf != out_buf) |
| 447 | av_frame_free(&buf); |
| 448 | |
| 449 | end: |
| 450 | vol->var_values[VAR_NB_CONSUMED_SAMPLES] += out_buf->nb_samples; |
| 451 | return ff_filter_frame(outlink, out_buf); |
| 452 | } |
| 453 | |
| 454 | static const AVFilterPad avfilter_af_volume_inputs[] = { |
| 455 | { |
| 456 | .name = "default", |
| 457 | .type = AVMEDIA_TYPE_AUDIO, |
| 458 | .filter_frame = filter_frame, |
| 459 | }, |
| 460 | { NULL } |
| 461 | }; |
| 462 | |
| 463 | static const AVFilterPad avfilter_af_volume_outputs[] = { |
| 464 | { |
| 465 | .name = "default", |
| 466 | .type = AVMEDIA_TYPE_AUDIO, |
| 467 | .config_props = config_output, |
| 468 | }, |
| 469 | { NULL } |
| 470 | }; |
| 471 | |
| 472 | AVFilter ff_af_volume = { |
| 473 | .name = "volume", |
| 474 | .description = NULL_IF_CONFIG_SMALL("Change input volume."), |
| 475 | .query_formats = query_formats, |
| 476 | .priv_size = sizeof(VolumeContext), |
| 477 | .priv_class = &volume_class, |
| 478 | .init = init, |
| 479 | .uninit = uninit, |
| 480 | .inputs = avfilter_af_volume_inputs, |
| 481 | .outputs = avfilter_af_volume_outputs, |
| 482 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 483 | .process_command = process_command, |
| 484 | }; |