mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Marton Balint <cus@passwd.hu>pull/338/head
Marton Balint
5 years ago
parent
d7a0071a44
commit
2035620b7c
6 changed files with 254 additions and 1 deletions
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/*
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* Copyright (c) 2020 Marton Balint |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "bsf.h" |
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#include "libavutil/avassert.h" |
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#include "libavutil/opt.h" |
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typedef struct PCMContext { |
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const AVClass *class; |
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int nb_out_samples; |
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int pad; |
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AVRational frame_rate; |
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AVPacket *in_pkt; |
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AVPacket *out_pkt; |
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int sample_size; |
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int64_t n; |
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} PCMContext; |
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static int init(AVBSFContext *ctx) |
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{ |
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PCMContext *s = ctx->priv_data; |
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AVRational sr = av_make_q(ctx->par_in->sample_rate, 1); |
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int64_t min_samples; |
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if (ctx->par_in->channels <= 0 || ctx->par_in->sample_rate <= 0) |
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return AVERROR(EINVAL); |
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ctx->time_base_out = av_inv_q(sr); |
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s->sample_size = ctx->par_in->channels * av_get_bits_per_sample(ctx->par_in->codec_id) / 8; |
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if (s->frame_rate.num) { |
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min_samples = av_rescale_q_rnd(1, sr, s->frame_rate, AV_ROUND_DOWN); |
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} else { |
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min_samples = s->nb_out_samples; |
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} |
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if (min_samples <= 0 || min_samples > INT_MAX / s->sample_size - 1) |
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return AVERROR(EINVAL); |
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s->in_pkt = av_packet_alloc(); |
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s->out_pkt = av_packet_alloc(); |
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if (!s->in_pkt || !s->out_pkt) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static void uninit(AVBSFContext *ctx) |
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{ |
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PCMContext *s = ctx->priv_data; |
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av_packet_free(&s->in_pkt); |
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av_packet_free(&s->out_pkt); |
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} |
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static void flush(AVBSFContext *ctx) |
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{ |
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PCMContext *s = ctx->priv_data; |
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av_packet_unref(s->in_pkt); |
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av_packet_unref(s->out_pkt); |
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s->n = 0; |
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} |
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static int send_packet(PCMContext *s, int nb_samples, AVPacket *pkt) |
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{ |
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pkt->duration = nb_samples; |
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s->n++; |
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return 0; |
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} |
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static void drain_packet(AVPacket *pkt, int drain_data, int drain_samples) |
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{ |
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pkt->size -= drain_data; |
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pkt->data += drain_data; |
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if (pkt->dts != AV_NOPTS_VALUE) |
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pkt->dts += drain_samples; |
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if (pkt->pts != AV_NOPTS_VALUE) |
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pkt->pts += drain_samples; |
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} |
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static int get_next_nb_samples(AVBSFContext *ctx) |
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{ |
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PCMContext *s = ctx->priv_data; |
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if (s->frame_rate.num) { |
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AVRational sr = av_make_q(ctx->par_in->sample_rate, 1); |
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return av_rescale_q(s->n + 1, sr, s->frame_rate) - av_rescale_q(s->n, sr, s->frame_rate); |
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} else { |
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return s->nb_out_samples; |
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} |
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} |
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static int rechunk_filter(AVBSFContext *ctx, AVPacket *pkt) |
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{ |
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PCMContext *s = ctx->priv_data; |
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int nb_samples = get_next_nb_samples(ctx); |
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int data_size = nb_samples * s->sample_size; |
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int ret; |
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do { |
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if (s->in_pkt->size) { |
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if (s->out_pkt->size || s->in_pkt->size < data_size) { |
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int drain = FFMIN(s->in_pkt->size, data_size - s->out_pkt->size); |
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if (!s->out_pkt->size) { |
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ret = av_new_packet(s->out_pkt, data_size); |
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if (ret < 0) |
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return ret; |
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ret = av_packet_copy_props(s->out_pkt, s->in_pkt); |
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if (ret < 0) { |
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av_packet_unref(s->out_pkt); |
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return ret; |
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} |
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s->out_pkt->size = 0; |
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} |
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memcpy(s->out_pkt->data + s->out_pkt->size, s->in_pkt->data, drain); |
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s->out_pkt->size += drain; |
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drain_packet(s->in_pkt, drain, drain / s->sample_size); |
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if (!s->in_pkt->size) |
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av_packet_unref(s->in_pkt); |
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if (s->out_pkt->size == data_size) { |
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av_packet_move_ref(pkt, s->out_pkt); |
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return send_packet(s, nb_samples, pkt); |
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} |
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} else if (s->in_pkt->size > data_size) { |
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ret = av_packet_ref(pkt, s->in_pkt); |
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if (ret < 0) |
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return ret; |
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pkt->size = data_size; |
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drain_packet(s->in_pkt, data_size, nb_samples); |
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return send_packet(s, nb_samples, pkt); |
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} else { |
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av_assert0(s->in_pkt->size == data_size); |
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av_packet_move_ref(pkt, s->in_pkt); |
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return send_packet(s, nb_samples, pkt); |
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} |
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} |
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ret = ff_bsf_get_packet_ref(ctx, s->in_pkt); |
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if (ret == AVERROR_EOF && s->out_pkt->size) { |
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if (s->pad) { |
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memset(s->out_pkt->data + s->out_pkt->size, 0, data_size - s->out_pkt->size); |
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s->out_pkt->size = data_size; |
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} else { |
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nb_samples = s->out_pkt->size / s->sample_size; |
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} |
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av_packet_move_ref(pkt, s->out_pkt); |
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return send_packet(s, nb_samples, pkt); |
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} |
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if (ret >= 0) |
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av_packet_rescale_ts(s->in_pkt, ctx->time_base_in, ctx->time_base_out); |
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} while (ret >= 0); |
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return ret; |
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} |
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#define OFFSET(x) offsetof(PCMContext, x) |
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#define FLAGS (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_BSF_PARAM) |
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static const AVOption options[] = { |
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{ "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 }, |
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{ "n", "set the number of per-packet output samples", OFFSET(nb_out_samples), AV_OPT_TYPE_INT, {.i64=1024}, 1, INT_MAX, FLAGS }, |
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{ "pad", "pad last packet with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1} , 0, 1, FLAGS }, |
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{ "p", "pad last packet with zeros", OFFSET(pad), AV_OPT_TYPE_BOOL, {.i64=1} , 0, 1, FLAGS }, |
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{ "frame_rate", "set number of packets per second", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS }, |
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{ "r", "set number of packets per second", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS }, |
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{ NULL }, |
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}; |
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static const AVClass pcm_rechunk_class = { |
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.class_name = "pcm_rechunk_bsf", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static const enum AVCodecID codec_ids[] = { |
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AV_CODEC_ID_PCM_S16LE, |
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AV_CODEC_ID_PCM_S16BE, |
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AV_CODEC_ID_PCM_S8, |
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AV_CODEC_ID_PCM_S32LE, |
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AV_CODEC_ID_PCM_S32BE, |
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AV_CODEC_ID_PCM_S24LE, |
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AV_CODEC_ID_PCM_S24BE, |
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AV_CODEC_ID_PCM_F32BE, |
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AV_CODEC_ID_PCM_F32LE, |
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AV_CODEC_ID_PCM_F64BE, |
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AV_CODEC_ID_PCM_F64LE, |
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AV_CODEC_ID_PCM_S64LE, |
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AV_CODEC_ID_PCM_S64BE, |
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AV_CODEC_ID_PCM_F16LE, |
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AV_CODEC_ID_PCM_F24LE, |
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AV_CODEC_ID_NONE, |
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}; |
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const AVBitStreamFilter ff_pcm_rechunk_bsf = { |
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.name = "pcm_rechunk", |
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.priv_data_size = sizeof(PCMContext), |
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.priv_class = &pcm_rechunk_class, |
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.filter = rechunk_filter, |
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.init = init, |
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.flush = flush, |
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.close = uninit, |
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.codec_ids = codec_ids, |
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}; |
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