/* * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "common.h" #include "samplefmt.h" #include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct SampleFmtInfo { const char *name; int bits; int planar; enum AVSampleFormat altform; ///< planar<->packed alternative form } SampleFmtInfo; /** this table gives more information about formats */ static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = { [AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8, .planar = 0, .altform = AV_SAMPLE_FMT_U8P }, [AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16, .planar = 0, .altform = AV_SAMPLE_FMT_S16P }, [AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_S32P }, [AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32, .planar = 0, .altform = AV_SAMPLE_FMT_FLTP }, [AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64, .planar = 0, .altform = AV_SAMPLE_FMT_DBLP }, [AV_SAMPLE_FMT_U8P] = { .name = "u8p", .bits = 8, .planar = 1, .altform = AV_SAMPLE_FMT_U8 }, [AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1, .altform = AV_SAMPLE_FMT_S16 }, [AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_S32 }, [AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1, .altform = AV_SAMPLE_FMT_FLT }, [AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1, .altform = AV_SAMPLE_FMT_DBL }, }; const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt) { if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB) return NULL; return sample_fmt_info[sample_fmt].name; } enum AVSampleFormat av_get_sample_fmt(const char *name) { int i; for (i = 0; i < AV_SAMPLE_FMT_NB; i++) if (!strcmp(sample_fmt_info[i].name, name)) return i; return AV_SAMPLE_FMT_NONE; } enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt) { if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB) return AV_SAMPLE_FMT_NONE; if (sample_fmt_info[sample_fmt].planar) return sample_fmt_info[sample_fmt].altform; return sample_fmt; } enum AVSampleFormat av_get_planar_sample_fmt(enum AVSampleFormat sample_fmt) { if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB) return AV_SAMPLE_FMT_NONE; if (sample_fmt_info[sample_fmt].planar) return sample_fmt; return sample_fmt_info[sample_fmt].altform; } char *av_get_sample_fmt_string (char *buf, int buf_size, enum AVSampleFormat sample_fmt) { /* print header */ if (sample_fmt < 0) snprintf(buf, buf_size, "name " " depth"); else if (sample_fmt < AV_SAMPLE_FMT_NB) { SampleFmtInfo info = sample_fmt_info[sample_fmt]; snprintf (buf, buf_size, "%-6s" " %2d ", info.name, info.bits); } return buf; } int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt) { return sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB ? 0 : sample_fmt_info[sample_fmt].bits >> 3; } int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt) { if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB) return 0; return sample_fmt_info[sample_fmt].planar; } int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align) { int line_size; int sample_size = av_get_bytes_per_sample(sample_fmt); int planar = av_sample_fmt_is_planar(sample_fmt); /* validate parameter ranges */ if (!sample_size || nb_samples <= 0 || nb_channels <= 0) return AVERROR(EINVAL); /* auto-select alignment if not specified */ if (!align) { align = 1; nb_samples = FFALIGN(nb_samples, 32); } /* check for integer overflow */ if (nb_channels > INT_MAX / align || (int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size) return AVERROR(EINVAL); line_size = planar ? FFALIGN(nb_samples * sample_size, align) : FFALIGN(nb_samples * sample_size * nb_channels, align); if (linesize) *linesize = line_size; return planar ? line_size * nb_channels : line_size; } int av_samples_fill_arrays(uint8_t **audio_data, int *linesize, const uint8_t *buf, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align) { int ch, planar, buf_size, line_size; planar = av_sample_fmt_is_planar(sample_fmt); buf_size = av_samples_get_buffer_size(&line_size, nb_channels, nb_samples, sample_fmt, align); if (buf_size < 0) return buf_size; audio_data[0] = buf; for (ch = 1; planar && ch < nb_channels; ch++) audio_data[ch] = audio_data[ch-1] + line_size; if (linesize) *linesize = line_size; return 0; } int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels, int nb_samples, enum AVSampleFormat sample_fmt, int align) { uint8_t *buf; int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples, sample_fmt, align); if (size < 0) return size; buf = av_malloc(size); if (!buf) return AVERROR(ENOMEM); size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels, nb_samples, sample_fmt, align); if (size < 0) { av_free(buf); return size; } av_samples_set_silence(audio_data, 0, nb_samples, nb_channels, sample_fmt); return 0; } int av_samples_copy(uint8_t **dst, uint8_t * const *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt) { int planar = av_sample_fmt_is_planar(sample_fmt); int planes = planar ? nb_channels : 1; int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels); int data_size = nb_samples * block_align; int i; dst_offset *= block_align; src_offset *= block_align; for (i = 0; i < planes; i++) memcpy(dst[i] + dst_offset, src[i] + src_offset, data_size); return 0; } int av_samples_set_silence(uint8_t **audio_data, int offset, int nb_samples, int nb_channels, enum AVSampleFormat sample_fmt) { int planar = av_sample_fmt_is_planar(sample_fmt); int planes = planar ? nb_channels : 1; int block_align = av_get_bytes_per_sample(sample_fmt) * (planar ? 1 : nb_channels); int data_size = nb_samples * block_align; int fill_char = (sample_fmt == AV_SAMPLE_FMT_U8 || sample_fmt == AV_SAMPLE_FMT_U8P) ? 0x80 : 0x00; int i; offset *= block_align; for (i = 0; i < planes; i++) memset(audio_data[i] + offset, fill_char, data_size); return 0; }