| /* |
| * Copyright (c) 2020 Marton Balint |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avcodec.h" |
| #include "bsf_internal.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/opt.h" |
| |
| typedef struct PCMContext { |
| const AVClass *class; |
| |
| int nb_out_samples; |
| int pad; |
| AVRational frame_rate; |
| |
| AVPacket *in_pkt; |
| AVPacket *out_pkt; |
| int sample_size; |
| int64_t n; |
| } PCMContext; |
| |
| static int init(AVBSFContext *ctx) |
| { |
| PCMContext *s = ctx->priv_data; |
| AVRational sr = av_make_q(ctx->par_in->sample_rate, 1); |
| int64_t min_samples; |
| |
| if (ctx->par_in->channels <= 0 || ctx->par_in->sample_rate <= 0) |
| return AVERROR(EINVAL); |
| |
| ctx->time_base_out = av_inv_q(sr); |
| s->sample_size = ctx->par_in->channels * av_get_bits_per_sample(ctx->par_in->codec_id) / 8; |
| |
| if (s->frame_rate.num) { |
| min_samples = av_rescale_q_rnd(1, sr, s->frame_rate, AV_ROUND_DOWN); |
| } else { |
| min_samples = s->nb_out_samples; |
| } |
| if (min_samples <= 0 || min_samples > INT_MAX / s->sample_size - 1) |
| return AVERROR(EINVAL); |
| |
| s->in_pkt = av_packet_alloc(); |
| s->out_pkt = av_packet_alloc(); |
| if (!s->in_pkt || !s->out_pkt) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| static void uninit(AVBSFContext *ctx) |
| { |
| PCMContext *s = ctx->priv_data; |
| av_packet_free(&s->in_pkt); |
| av_packet_free(&s->out_pkt); |
| } |
| |
| static void flush(AVBSFContext *ctx) |
| { |
| PCMContext *s = ctx->priv_data; |
| av_packet_unref(s->in_pkt); |
| av_packet_unref(s->out_pkt); |
| s->n = 0; |
| } |
| |
| static int send_packet(PCMContext *s, int nb_samples, AVPacket *pkt) |
| { |
| pkt->duration = nb_samples; |
| s->n++; |
| return 0; |
| } |
| |
| static void drain_packet(AVPacket *pkt, int drain_data, int drain_samples) |
| { |
| pkt->size -= drain_data; |
| pkt->data += drain_data; |
| if (pkt->dts != AV_NOPTS_VALUE) |
| pkt->dts += drain_samples; |
| if (pkt->pts != AV_NOPTS_VALUE) |
| pkt->pts += drain_samples; |
| } |
| |
| static int get_next_nb_samples(AVBSFContext *ctx) |
| { |
| PCMContext *s = ctx->priv_data; |
| if (s->frame_rate.num) { |
| AVRational sr = av_make_q(ctx->par_in->sample_rate, 1); |
| return av_rescale_q(s->n + 1, sr, s->frame_rate) - av_rescale_q(s->n, sr, s->frame_rate); |
| } else { |
| return s->nb_out_samples; |
| } |
| } |
| |
| static int rechunk_filter(AVBSFContext *ctx, AVPacket *pkt) |
| { |
| PCMContext *s = ctx->priv_data; |
| int nb_samples = get_next_nb_samples(ctx); |
| int data_size = nb_samples * s->sample_size; |
| int ret; |
| |
| do { |
| if (s->in_pkt->size) { |
| if (s->out_pkt->size || s->in_pkt->size < data_size) { |
| int drain = FFMIN(s->in_pkt->size, data_size - s->out_pkt->size); |
| if (!s->out_pkt->size) { |
| ret = av_new_packet(s->out_pkt, data_size); |
| if (ret < 0) |
| return ret; |
| ret = av_packet_copy_props(s->out_pkt, s->in_pkt); |
| if (ret < 0) { |
| av_packet_unref(s->out_pkt); |
| return ret; |
| } |
| s->out_pkt->size = 0; |
| } |
| memcpy(s->out_pkt->data + s->out_pkt->size, s->in_pkt->data, drain); |
| s->out_pkt->size += drain; |
| drain_packet(s->in_pkt, drain, drain / s->sample_size); |
| if (!s->in_pkt->size) |
| av_packet_unref(s->in_pkt); |
| if (s->out_pkt->size == data_size) { |
| av_packet_move_ref(pkt, s->out_pkt); |
| return send_packet(s, nb_samples, pkt); |
| } |
| } else if (s->in_pkt->size > data_size) { |
| ret = av_packet_ref(pkt, s->in_pkt); |
| if (ret < 0) |
| return ret; |
| pkt->size = data_size; |
| drain_packet(s->in_pkt, data_size, nb_samples); |
| return send_packet(s, nb_samples, pkt); |
| } else { |
| av_assert0(s->in_pkt->size == data_size); |
| av_packet_move_ref(pkt, s->in_pkt); |
| return send_packet(s, nb_samples, pkt); |
| } |
| } |
| |
| ret = ff_bsf_get_packet_ref(ctx, s->in_pkt); |
| if (ret == AVERROR_EOF && s->out_pkt->size) { |
| if (s->pad) { |
| memset(s->out_pkt->data + s->out_pkt->size, 0, data_size - s->out_pkt->size); |
| s->out_pkt->size = data_size; |
| } else { |
| nb_samples = s->out_pkt->size / s->sample_size; |
| } |
| av_packet_move_ref(pkt, s->out_pkt); |
| return send_packet(s, nb_samples, pkt); |
| } |
| if (ret >= 0) |
| av_packet_rescale_ts(s->in_pkt, ctx->time_base_in, ctx->time_base_out); |
| } while (ret >= 0); |
| |
| return ret; |
| } |
| |
| #define OFFSET(x) offsetof(PCMContext, x) |
| #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_BSF_PARAM) |
| static const AVOption options[] = { |
| { "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 }, |
| { "n", "set the number of per-packet output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS }, |
| { "pad", "pad last packet with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1} , 0, 1, FLAGS }, |
| { "p", "pad last packet with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1} , 0, 1, FLAGS }, |
| { "frame_rate", "set number of packets per second", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS }, |
| { "r", "set number of packets per second", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS }, |
| { NULL }, |
| }; |
| |
| static const AVClass pcm_rechunk_class = { |
| .class_name = "pcm_rechunk_bsf", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| static const enum AVCodecID codec_ids[] = { |
| AV_CODEC_ID_PCM_S16LE, |
| AV_CODEC_ID_PCM_S16BE, |
| AV_CODEC_ID_PCM_S8, |
| AV_CODEC_ID_PCM_S32LE, |
| AV_CODEC_ID_PCM_S32BE, |
| AV_CODEC_ID_PCM_S24LE, |
| AV_CODEC_ID_PCM_S24BE, |
| AV_CODEC_ID_PCM_F32BE, |
| AV_CODEC_ID_PCM_F32LE, |
| AV_CODEC_ID_PCM_F64BE, |
| AV_CODEC_ID_PCM_F64LE, |
| AV_CODEC_ID_PCM_S64LE, |
| AV_CODEC_ID_PCM_S64BE, |
| AV_CODEC_ID_PCM_F16LE, |
| AV_CODEC_ID_PCM_F24LE, |
| AV_CODEC_ID_NONE, |
| }; |
| |
| const AVBitStreamFilter ff_pcm_rechunk_bsf = { |
| .name = "pcm_rechunk", |
| .priv_data_size = sizeof(PCMContext), |
| .priv_class = &pcm_rechunk_class, |
| .filter = rechunk_filter, |
| .init = init, |
| .flush = flush, |
| .close = uninit, |
| .codec_ids = codec_ids, |
| }; |