/* * Various functions used by both muxers and demuxers * Copyright (c) 2000, 2001, 2002 Fabrice Bellard * * 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 <math.h>#include "libavutil/avassert.h"#include "libavutil/avstring.h"#include "libavutil/channel_layout.h"#include "libavutil/intreadwrite.h"#include "libavutil/mem.h"#include "libavutil/opt.h"#include "libavutil/pixfmt.h"#include "libavutil/samplefmt.h"#include "libavcodec/avcodec.h"#include "libavcodec/bsf.h"#include "libavcodec/codec_desc.h"#include "libavcodec/packet_internal.h"#include "avformat.h"#include "avio.h"#include "demux.h"#include "internal.h" void ff_free_stream(AVStream **pst){    AVStream *st = *pst;    FFStream *const sti = ffstream(st);     if (!st)        return;     for (int i = 0; i < st->nb_side_data; i++)        av_freep(&st->side_data[i].data);    av_freep(&st->side_data);     if (st->attached_pic.data)        av_packet_unref(&st->attached_pic);     av_parser_close(sti->parser);    avcodec_free_context(&sti->avctx);    av_bsf_free(&sti->bsfc);    av_freep(&sti->priv_pts);    av_freep(&sti->index_entries);    av_freep(&sti->probe_data.buf);     av_bsf_free(&sti->extract_extradata.bsf);     if (sti->info) {        av_freep(&sti->info->duration_error);        av_freep(&sti->info);    }     av_dict_free(&st->metadata);    avcodec_parameters_free(&st->codecpar);    av_freep(&st->priv_data);     av_freep(pst);} void ff_remove_stream(AVFormatContext *s, AVStream *st){    av_assert0(s->nb_streams>0);    av_assert0(s->streams[ s->nb_streams - 1 ] == st);     ff_free_stream(&s->streams[ --s->nb_streams ]);} /* XXX: suppress the packet queue */void ff_flush_packet_queue(AVFormatContext *s){    FFFormatContext *const si = ffformatcontext(s);    avpriv_packet_list_free(&si->parse_queue);    avpriv_packet_list_free(&si->packet_buffer);    avpriv_packet_list_free(&si->raw_packet_buffer);     si->raw_packet_buffer_size = 0;} void avformat_free_context(AVFormatContext *s){    FFFormatContext *si;     if (!s)        return;    si = ffformatcontext(s);     if (s->oformat && s->oformat->deinit && si->initialized)        s->oformat->deinit(s);     av_opt_free(s);    if (s->iformat && s->iformat->priv_class && s->priv_data)        av_opt_free(s->priv_data);    if (s->oformat && s->oformat->priv_class && s->priv_data)        av_opt_free(s->priv_data);     for (unsigned i = 0; i < s->nb_streams; i++)        ff_free_stream(&s->streams[i]);    s->nb_streams = 0;     for (unsigned i = 0; i < s->nb_programs; i++) {        av_dict_free(&s->programs[i]->metadata);        av_freep(&s->programs[i]->stream_index);        av_freep(&s->programs[i]);    }    s->nb_programs = 0;     av_freep(&s->programs);    av_freep(&s->priv_data);    while (s->nb_chapters--) {        av_dict_free(&s->chapters[s->nb_chapters]->metadata);        av_freep(&s->chapters[s->nb_chapters]);    }    av_freep(&s->chapters);    av_dict_free(&s->metadata);    av_dict_free(&si->id3v2_meta);    av_packet_free(&si->pkt);    av_packet_free(&si->parse_pkt);    av_freep(&s->streams);    ff_flush_packet_queue(s);    av_freep(&s->url);    av_free(s);} uint8_t *av_stream_get_side_data(const AVStream *st,                                 enum AVPacketSideDataType type, size_t *size){    for (int i = 0; i < st->nb_side_data; i++) {        if (st->side_data[i].type == type) {            if (size)                *size = st->side_data[i].size;            return st->side_data[i].data;        }    }    if (size)        *size = 0;    return NULL;} int av_stream_add_side_data(AVStream *st, enum AVPacketSideDataType type,                            uint8_t *data, size_t size){    AVPacketSideData *sd, *tmp;     for (int i = 0; i < st->nb_side_data; i++) {        sd = &st->side_data[i];         if (sd->type == type) {            av_freep(&sd->data);            sd->data = data;            sd->size = size;            return 0;        }    }     if (st->nb_side_data + 1U > FFMIN(INT_MAX, SIZE_MAX / sizeof(*tmp)))        return AVERROR(ERANGE);     tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));    if (!tmp) {        return AVERROR(ENOMEM);    }     st->side_data = tmp;    st->nb_side_data++;     sd = &st->side_data[st->nb_side_data - 1];    sd->type = type;    sd->data = data;    sd->size = size;     return 0;} uint8_t *av_stream_new_side_data(AVStream *st, enum AVPacketSideDataType type,                                 size_t size){    int ret;    uint8_t *data = av_malloc(size);     if (!data)        return NULL;     ret = av_stream_add_side_data(st, type, data, size);    if (ret < 0) {        av_freep(&data);        return NULL;    }     return data;} int ff_stream_side_data_copy(AVStream *dst, const AVStream *src){    /* Free existing side data*/    for (int i = 0; i < dst->nb_side_data; i++)        av_free(dst->side_data[i].data);    av_freep(&dst->side_data);    dst->nb_side_data = 0;     /* Copy side data if present */    if (src->nb_side_data) {        dst->side_data = av_calloc(src->nb_side_data,                                   sizeof(*dst->side_data));        if (!dst->side_data)            return AVERROR(ENOMEM);        dst->nb_side_data = src->nb_side_data;         for (int i = 0; i < src->nb_side_data; i++) {            uint8_t *data = av_memdup(src->side_data[i].data,                                      src->side_data[i].size);            if (!data)                return AVERROR(ENOMEM);            dst->side_data[i].type = src->side_data[i].type;            dst->side_data[i].size = src->side_data[i].size;            dst->side_data[i].data = data;        }    }     return 0;} /** * Copy all stream parameters from source to destination stream, with the * exception of the index field, which is usually set by avformat_new_stream(). * * @param dst pointer to destination AVStream * @param src pointer to source AVStream * @return >=0 on success, AVERROR code on error */static int stream_params_copy(AVStream *dst, const AVStream *src){    int ret;     dst->id                  = src->id;    dst->time_base           = src->time_base;    dst->start_time          = src->start_time;    dst->duration            = src->duration;    dst->nb_frames           = src->nb_frames;    dst->disposition         = src->disposition;    dst->discard             = src->discard;    dst->sample_aspect_ratio = src->sample_aspect_ratio;    dst->avg_frame_rate      = src->avg_frame_rate;    dst->event_flags         = src->event_flags;    dst->r_frame_rate        = src->r_frame_rate;    dst->pts_wrap_bits       = src->pts_wrap_bits;     av_dict_free(&dst->metadata);    ret = av_dict_copy(&dst->metadata, src->metadata, 0);    if (ret < 0)        return ret;     ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);    if (ret < 0)        return ret;     ret = ff_stream_side_data_copy(dst, src);    if (ret < 0)        return ret;     av_packet_unref(&dst->attached_pic);    if (src->attached_pic.data) {        ret = av_packet_ref(&dst->attached_pic, &src->attached_pic);        if (ret < 0)            return ret;    }     return 0;} AVStream *ff_stream_clone(AVFormatContext *dst_ctx, const AVStream *src){    AVStream *st;    int ret;     st = avformat_new_stream(dst_ctx, NULL);    if (!st)        return NULL;     ret = stream_params_copy(st, src);    if (ret < 0) {        ff_remove_stream(dst_ctx, st);        return NULL;    }     return st;} AVProgram *av_new_program(AVFormatContext *ac, int id){    AVProgram *program = NULL;    int ret;     av_log(ac, AV_LOG_TRACE, "new_program: id=0x%04x\n", id);     for (unsigned i = 0; i < ac->nb_programs; i++)        if (ac->programs[i]->id == id)            program = ac->programs[i];     if (!program) {        program = av_mallocz(sizeof(*program));        if (!program)            return NULL;        ret = av_dynarray_add_nofree(&ac->programs, &ac->nb_programs, program);        if (ret < 0) {            av_free(program);            return NULL;        }        program->discard = AVDISCARD_NONE;        program->pmt_version = -1;        program->id = id;        program->pts_wrap_reference = AV_NOPTS_VALUE;        program->pts_wrap_behavior = AV_PTS_WRAP_IGNORE;        program->start_time =        program->end_time   = AV_NOPTS_VALUE;    }    return program;} void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned idx){    AVProgram *program = NULL;    void *tmp;     if (idx >= ac->nb_streams) {        av_log(ac, AV_LOG_ERROR, "stream index %d is not valid\n", idx);        return;    }     for (unsigned i = 0; i < ac->nb_programs; i++) {        if (ac->programs[i]->id != progid)            continue;        program = ac->programs[i];        for (unsigned j = 0; j < program->nb_stream_indexes; j++)            if (program->stream_index[j] == idx)                return;         tmp = av_realloc_array(program->stream_index, program->nb_stream_indexes+1, sizeof(unsigned int));        if (!tmp)            return;        program->stream_index = tmp;        program->stream_index[program->nb_stream_indexes++] = idx;        return;    }} AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s){    for (unsigned i = 0; i < ic->nb_programs; i++) {        if (ic->programs[i] == last) {            last = NULL;        } else {            if (!last)                for (unsigned j = 0; j < ic->programs[i]->nb_stream_indexes; j++)                    if (ic->programs[i]->stream_index[j] == s)                        return ic->programs[i];        }    }    return NULL;} int av_find_default_stream_index(AVFormatContext *s){    int best_stream = 0;    int best_score = INT_MIN;     if (s->nb_streams <= 0)        return -1;    for (unsigned i = 0; i < s->nb_streams; i++) {        const AVStream *const st = s->streams[i];        const FFStream *const sti = cffstream(st);        int score = 0;        if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {            if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)                score -= 400;            if (st->codecpar->width && st->codecpar->height)                score += 50;            score+= 25;        }        if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {            if (st->codecpar->sample_rate)                score += 50;        }        if (sti->codec_info_nb_frames)            score += 12;         if (st->discard != AVDISCARD_ALL)            score += 200;         if (score > best_score) {            best_score = score;            best_stream = i;        }    }    return best_stream;} int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type,                        int wanted_stream_nb, int related_stream,                        const AVCodec **decoder_ret, int flags){    int nb_streams = ic->nb_streams;    int ret = AVERROR_STREAM_NOT_FOUND;    int best_count = -1, best_multiframe = -1, best_disposition = -1;    int count, multiframe, disposition;    int64_t best_bitrate = -1;    int64_t bitrate;    unsigned *program = NULL;    const AVCodec *decoder = NULL, *best_decoder = NULL;     if (related_stream >= 0 && wanted_stream_nb < 0) {        AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);        if (p) {            program    = p->stream_index;            nb_streams = p->nb_stream_indexes;        }    }    for (unsigned i = 0; i < nb_streams; i++) {        int real_stream_index = program ? program[i] : i;        AVStream *st          = ic->streams[real_stream_index];        AVCodecParameters *par = st->codecpar;        if (par->codec_type != type)            continue;        if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)            continue;        if (type == AVMEDIA_TYPE_AUDIO && !(par->ch_layout.nb_channels && par->sample_rate))            continue;        if (decoder_ret) {            decoder = ff_find_decoder(ic, st, par->codec_id);            if (!decoder) {                if (ret < 0)                    ret = AVERROR_DECODER_NOT_FOUND;                continue;            }        }        disposition = !(st->disposition & (AV_DISPOSITION_HEARING_IMPAIRED | AV_DISPOSITION_VISUAL_IMPAIRED))                      + !! (st->disposition & AV_DISPOSITION_DEFAULT);        count = ffstream(st)->codec_info_nb_frames;        bitrate = par->bit_rate;        multiframe = FFMIN(5, count);        if ((best_disposition >  disposition) ||            (best_disposition == disposition && best_multiframe >  multiframe) ||            (best_disposition == disposition && best_multiframe == multiframe && best_bitrate >  bitrate) ||            (best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))            continue;        best_disposition = disposition;        best_count   = count;        best_bitrate = bitrate;        best_multiframe = multiframe;        ret          = real_stream_index;        best_decoder = decoder;        if (program && i == nb_streams - 1 && ret < 0) {            program    = NULL;            nb_streams = ic->nb_streams;            /* no related stream found, try again with everything */            i = 0;        }    }    if (decoder_ret)        *decoder_ret = best_decoder;    return ret;} /** * Matches a stream specifier (but ignores requested index). * * @param indexptr set to point to the requested stream index if there is one * * @return <0 on error *         0  if st is NOT a matching stream *         >0 if st is a matching stream */static int match_stream_specifier(const AVFormatContext *s, const AVStream *st,                                  const char *spec, const char **indexptr,                                  const AVProgram **p){    int match = 1;                      /* Stores if the specifier matches so far. */    while (*spec) {        if (*spec <= '9' && *spec >= '0') { /* opt:index */            if (indexptr)                *indexptr = spec;            return match;        } else if (*spec == 'v' || *spec == 'a' || *spec == 's' || *spec == 'd' ||                   *spec == 't' || *spec == 'V') { /* opt:[vasdtV] */            enum AVMediaType type;

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