githubmirror/FFmpeg

libavdevice/libcdio.c
192 строки7 KB
Andreas Rheinhardt
avformat/avformat: Add FFInputFormat, hide internals of AVInputFormat
07 мар 2024, 14:53
07 мар 2024, 14:53b800327
/*
 * Copyright (c) 2011 Anton Khirnov <anton@khirnov.net>
 *
 * 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
 */

/**
 * @file
 * libcdio CD grabbing
 */

#include "config.h"

#if HAVE_CDIO_PARANOIA_H
#include <cdio/cdda.h>
#include <cdio/paranoia.h>
#elif HAVE_CDIO_PARANOIA_PARANOIA_H
#include <cdio/paranoia/cdda.h>
#include <cdio/paranoia/paranoia.h>
#endif

#include "libavutil/log.h"
#include "libavutil/opt.h"

#include "libavformat/avformat.h"
#include "libavformat/demux.h"
#include "libavformat/internal.h"

typedef struct CDIOContext {
    const AVClass       *class;
    cdrom_drive_t       *drive;
    cdrom_paranoia_t *paranoia;
    int32_t last_sector;

    /* private options */
    int speed;
    int paranoia_mode;
} CDIOContext;

static av_cold int read_header(AVFormatContext *ctx)
{
    CDIOContext *s = ctx->priv_data;
    AVStream *st;
    int ret, i;
    char *err = NULL;

    if (!(st = avformat_new_stream(ctx, NULL)))
        return AVERROR(ENOMEM);
    s->drive = cdio_cddap_identify(ctx->url, CDDA_MESSAGE_LOGIT, &err);
    if (!s->drive) {
        av_log(ctx, AV_LOG_ERROR, "Could not open drive %s.\n", ctx->url);
        return AVERROR(EINVAL);
    }
    if (err) {
        av_log(ctx, AV_LOG_VERBOSE, "%s\n", err);
        free(err);
    }
    if ((ret = cdio_cddap_open(s->drive)) < 0 || !s->drive->opened) {
        av_log(ctx, AV_LOG_ERROR, "Could not open disk in drive %s.\n", ctx->url);
        return AVERROR(EINVAL);
    }

    cdio_cddap_verbose_set(s->drive, CDDA_MESSAGE_LOGIT, CDDA_MESSAGE_LOGIT);
    if (s->speed)
        cdio_cddap_speed_set(s->drive, s->speed);

    s->paranoia = cdio_paranoia_init(s->drive);
    if (!s->paranoia) {
        av_log(ctx, AV_LOG_ERROR, "Could not init paranoia.\n");
        return AVERROR(EINVAL);
    }
    cdio_paranoia_modeset(s->paranoia, s->paranoia_mode);

    st->codecpar->codec_type      = AVMEDIA_TYPE_AUDIO;
    if (s->drive->bigendianp)
        st->codecpar->codec_id    = AV_CODEC_ID_PCM_S16BE;
    else
        st->codecpar->codec_id    = AV_CODEC_ID_PCM_S16LE;
    st->codecpar->sample_rate     = 44100;
    st->codecpar->ch_layout       = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
    if (s->drive->audio_last_sector != CDIO_INVALID_LSN &&
        s->drive->audio_first_sector != CDIO_INVALID_LSN)
        st->duration           = s->drive->audio_last_sector - s->drive->audio_first_sector;
    else if (s->drive->tracks)
        st->duration = s->drive->disc_toc[s->drive->tracks].dwStartSector;
    avpriv_set_pts_info(st, 64, CDIO_CD_FRAMESIZE_RAW,
                        2 * st->codecpar->ch_layout.nb_channels * st->codecpar->sample_rate);

    for (i = 0; i < s->drive->tracks; i++) {
        char title[16];
        snprintf(title, sizeof(title), "track %02d", s->drive->disc_toc[i].bTrack);
        avpriv_new_chapter(ctx, i, st->time_base, s->drive->disc_toc[i].dwStartSector,
                       s->drive->disc_toc[i+1].dwStartSector, title);
    }

    s->last_sector = cdio_cddap_disc_lastsector(s->drive);

    return 0;
}

static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
{
    CDIOContext *s = ctx->priv_data;
    int ret;
    uint16_t *buf;
    char *err = NULL;

    buf = cdio_paranoia_read(s->paranoia, NULL);
    if (!buf)
        return AVERROR_EOF;

    if (err = cdio_cddap_errors(s->drive)) {
        av_log(ctx, AV_LOG_ERROR, "%s\n", err);
        free(err);
        err = NULL;
    }
    if (err = cdio_cddap_messages(s->drive)) {
        av_log(ctx, AV_LOG_VERBOSE, "%s\n", err);
        free(err);
        err = NULL;
    }

    if ((ret = av_new_packet(pkt, CDIO_CD_FRAMESIZE_RAW)) < 0)
        return ret;
    memcpy(pkt->data, buf, CDIO_CD_FRAMESIZE_RAW);
    return 0;
}

static av_cold int read_close(AVFormatContext *ctx)
{
    CDIOContext *s = ctx->priv_data;
    cdio_paranoia_free(s->paranoia);
    cdio_cddap_close(s->drive);
    return 0;
}

static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp,
                     int flags)
{
    CDIOContext *s = ctx->priv_data;
    AVStream *st = ctx->streams[0];

    cdio_paranoia_seek(s->paranoia, timestamp, SEEK_SET);
    avpriv_update_cur_dts(ctx, st, timestamp);
    return 0;
}

#define OFFSET(x) offsetof(CDIOContext, x)
#define DEC AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
    { "speed",              "set drive reading speed", OFFSET(speed),         AV_OPT_TYPE_INT,   { .i64 = 0 }, 0,       INT_MAX, DEC },
    { "paranoia_mode",      "set error recovery mode", OFFSET(paranoia_mode), AV_OPT_TYPE_FLAGS, { .i64 = PARANOIA_MODE_DISABLE }, INT_MIN, INT_MAX, DEC, .unit = "paranoia_mode" },
        { "disable",        "apply no fixups",                      0,    AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_DISABLE },   0, 0, DEC, .unit = "paranoia_mode" },
        { "verify",         "verify data integrity in overlap area", 0,   AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_VERIFY },    0, 0, DEC, .unit = "paranoia_mode" },
        { "overlap",        "perform overlapped reads",             0,    AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_OVERLAP },   0, 0, DEC, .unit = "paranoia_mode" },
        { "neverskip",      "do not skip failed reads",             0,    AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_NEVERSKIP }, 0, 0, DEC, .unit = "paranoia_mode" },
        { "full",           "apply all recovery modes",             0,    AV_OPT_TYPE_CONST, { .i64 = PARANOIA_MODE_FULL },      0, 0, DEC, .unit = "paranoia_mode" },
    { NULL },
};

static const AVClass libcdio_class = {
    .class_name = "libcdio indev",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
    .category   = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
};

const FFInputFormat ff_libcdio_demuxer = {
    .p.name         = "libcdio",
    .p.flags        = AVFMT_NOFILE,
    .p.priv_class   = &libcdio_class,
    .read_header    = read_header,
    .read_packet    = read_packet,
    .read_close     = read_close,
    .read_seek      = read_seek,
    .priv_data_size = sizeof(CDIOContext),
};