Exemplo n.º 1
0
AVInputFormat *av_iformat_next(const AVInputFormat *f)
{
    ff_thread_once(&av_format_next_init, av_format_init_next);

    if (f)
        return f->next;
    else {
        void *opaque = NULL;
        return (AVInputFormat *)av_demuxer_iterate(&opaque);
    }
}
Exemplo n.º 2
0
int ff_img_read_header(AVFormatContext *s1)
{
    VideoDemuxData *s = s1->priv_data;
    int first_index = 1, last_index = 1;
    AVStream *st;
    enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;

    s1->ctx_flags |= AVFMTCTX_NOHEADER;

    st = avformat_new_stream(s1, NULL);
    if (!st) {
        return AVERROR(ENOMEM);
    }

    if (s->pixel_format &&
        (pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
        av_log(s1, AV_LOG_ERROR, "No such pixel format: %s.\n",
               s->pixel_format);
        return AVERROR(EINVAL);
    }

    av_strlcpy(s->path, s1->url, sizeof(s->path));
    s->img_number = 0;
    s->img_count  = 0;

    /* find format */
    if (s1->iformat->flags & AVFMT_NOFILE)
        s->is_pipe = 0;
    else {
        s->is_pipe       = 1;
        st->need_parsing = AVSTREAM_PARSE_FULL;
    }

    if (s->ts_from_file == 2) {
#if !HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
        av_log(s1, AV_LOG_ERROR, "POSIX.1-2008 not supported, nanosecond file timestamps unavailable\n");
        return AVERROR(ENOSYS);
#endif
        avpriv_set_pts_info(st, 64, 1, 1000000000);
    } else if (s->ts_from_file)
        avpriv_set_pts_info(st, 64, 1, 1);
    else
        avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);

    if (s->width && s->height) {
        st->codecpar->width  = s->width;
        st->codecpar->height = s->height;
    }

    if (!s->is_pipe) {
        if (s->pattern_type == PT_DEFAULT) {
            if (s1->pb) {
                s->pattern_type = PT_NONE;
            } else
                s->pattern_type = PT_GLOB_SEQUENCE;
        }

        if (s->pattern_type == PT_GLOB_SEQUENCE) {
        s->use_glob = is_glob(s->path);
        if (s->use_glob) {
#if HAVE_GLOB
            char *p = s->path, *q, *dup;
            int gerr;
#endif

            av_log(s1, AV_LOG_WARNING, "Pattern type 'glob_sequence' is deprecated: "
                   "use pattern_type 'glob' instead\n");
#if HAVE_GLOB
            dup = q = av_strdup(p);
            while (*q) {
                /* Do we have room for the next char and a \ insertion? */
                if ((p - s->path) >= (sizeof(s->path) - 2))
                  break;
                if (*q == '%' && strspn(q + 1, "%*?[]{}"))
                    ++q;
                else if (strspn(q, "\\*?[]{}"))
                    *p++ = '\\';
                *p++ = *q++;
            }
            *p = 0;
            av_free(dup);

            gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
            if (gerr != 0) {
                return AVERROR(ENOENT);
            }
            first_index = 0;
            last_index = s->globstate.gl_pathc - 1;
#endif
        }
        }
        if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) {
            if (find_image_range(s1->pb, &first_index, &last_index, s->path,
                                 s->start_number, s->start_number_range) < 0) {
                av_log(s1, AV_LOG_ERROR,
                       "Could find no file with path '%s' and index in the range %d-%d\n",
                       s->path, s->start_number, s->start_number + s->start_number_range - 1);
                return AVERROR(ENOENT);
            }
        } else if (s->pattern_type == PT_GLOB) {
#if HAVE_GLOB
            int gerr;
            gerr = glob(s->path, GLOB_NOCHECK|GLOB_BRACE|GLOB_NOMAGIC, NULL, &s->globstate);
            if (gerr != 0) {
                return AVERROR(ENOENT);
            }
            first_index = 0;
            last_index = s->globstate.gl_pathc - 1;
            s->use_glob = 1;
#else
            av_log(s1, AV_LOG_ERROR,
                   "Pattern type 'glob' was selected but globbing "
                   "is not supported by this libavformat build\n");
            return AVERROR(ENOSYS);
#endif
        } else if (s->pattern_type != PT_GLOB_SEQUENCE && s->pattern_type != PT_NONE) {
            av_log(s1, AV_LOG_ERROR,
                   "Unknown value '%d' for pattern_type option\n", s->pattern_type);
            return AVERROR(EINVAL);
        }
        s->img_first  = first_index;
        s->img_last   = last_index;
        s->img_number = first_index;
        /* compute duration */
        if (!s->ts_from_file) {
            st->start_time = 0;
            st->duration   = last_index - first_index + 1;
        }
    }

    if (s1->video_codec_id) {
        st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
        st->codecpar->codec_id   = s1->video_codec_id;
    } else if (s1->audio_codec_id) {
        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
        st->codecpar->codec_id   = s1->audio_codec_id;
    } else if (s1->iformat->raw_codec_id) {
        st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
        st->codecpar->codec_id   = s1->iformat->raw_codec_id;
    } else {
        const char *str = strrchr(s->path, '.');
        s->split_planes       = str && !av_strcasecmp(str + 1, "y");
        st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
        if (s1->pb) {
            int probe_buffer_size = 2048;
            uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
            const AVInputFormat *fmt = NULL;
            void *fmt_iter = NULL;
            AVProbeData pd = { 0 };

            if (!probe_buffer)
                return AVERROR(ENOMEM);

            probe_buffer_size = avio_read(s1->pb, probe_buffer, probe_buffer_size);
            if (probe_buffer_size < 0) {
                av_free(probe_buffer);
                return probe_buffer_size;
            }
            memset(probe_buffer + probe_buffer_size, 0, AVPROBE_PADDING_SIZE);

            pd.buf = probe_buffer;
            pd.buf_size = probe_buffer_size;
            pd.filename = s1->url;

            while ((fmt = av_demuxer_iterate(&fmt_iter))) {
                if (fmt->read_header != ff_img_read_header ||
                    !fmt->read_probe ||
                    (fmt->flags & AVFMT_NOFILE) ||
                    !fmt->raw_codec_id)
                    continue;
                if (fmt->read_probe(&pd) > 0) {
                    st->codecpar->codec_id = fmt->raw_codec_id;
                    break;
                }
            }
            if (s1->flags & AVFMT_FLAG_CUSTOM_IO) {
                avio_seek(s1->pb, 0, SEEK_SET);
            } else
                ffio_rewind_with_probe_data(s1->pb, &probe_buffer, probe_buffer_size);
        }
        if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
            st->codecpar->codec_id = ff_guess_image2_codec(s->path);
        if (st->codecpar->codec_id == AV_CODEC_ID_LJPEG)
            st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
        if (st->codecpar->codec_id == AV_CODEC_ID_ALIAS_PIX) // we cannot distingiush this from BRENDER_PIX
            st->codecpar->codec_id = AV_CODEC_ID_NONE;
    }
    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
        pix_fmt != AV_PIX_FMT_NONE)
        st->codecpar->format = pix_fmt;

    return 0;
}