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#include "libavutil/avstring.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "pcm.h" |
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static int nsp_probe(const AVProbeData *p) |
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{ |
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if (AV_RB32(p->buf) == AV_RB32("FORM") && |
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AV_RB32(p->buf + 4) == AV_RB32("DS16")) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int nsp_read_header(AVFormatContext *s) |
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{ |
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int channels = 0, rate = 0; |
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uint32_t chunk, size; |
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AVStream *st; |
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int64_t pos; |
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avio_skip(s->pb, 12); |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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while (!avio_feof(s->pb)) { |
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char value[1024]; |
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chunk = avio_rb32(s->pb); |
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size = avio_rl32(s->pb); |
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pos = avio_tell(s->pb); |
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switch (chunk) { |
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case MKBETAG('H', 'E', 'D', 'R'): |
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case MKBETAG('H', 'D', 'R', '8'): |
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if (size < 32) |
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return AVERROR_INVALIDDATA; |
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avio_skip(s->pb, 20); |
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rate = avio_rl32(s->pb); |
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avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); |
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break; |
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case MKBETAG('N', 'O', 'T', 'E'): |
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avio_get_str(s->pb, size, value, sizeof(value)); |
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av_dict_set(&s->metadata, "Comment", value, 0); |
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avio_skip(s->pb, size & 1); |
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break; |
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case MKBETAG('S', 'D', 'A', 'B'): |
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channels = 2; |
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break; |
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case MKBETAG('S', 'D', '_', '2'): |
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case MKBETAG('S', 'D', '_', '3'): |
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case MKBETAG('S', 'D', '_', '4'): |
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case MKBETAG('S', 'D', '_', '5'): |
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case MKBETAG('S', 'D', '_', '6'): |
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case MKBETAG('S', 'D', '_', '7'): |
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case MKBETAG('S', 'D', '_', '8'): |
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av_log(s, AV_LOG_WARNING, "Unsupported chunk!\n"); |
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case MKBETAG('S', 'D', 'A', '_'): |
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case MKBETAG('S', 'D', '_', 'A'): |
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channels = 1; |
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break; |
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} |
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if (channels) |
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break; |
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} |
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->ch_layout.nb_channels = channels; |
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st->codecpar->sample_rate = rate; |
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
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st->codecpar->block_align = 2 * channels; |
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return 0; |
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} |
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const AVInputFormat ff_nsp_demuxer = { |
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.name = "nsp", |
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.long_name = NULL_IF_CONFIG_SMALL("Computerized Speech Lab NSP"), |
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.read_probe = nsp_probe, |
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.read_header = nsp_read_header, |
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.read_packet = ff_pcm_read_packet, |
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.read_seek = ff_pcm_read_seek, |
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.extensions = "nsp", |
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.flags = AVFMT_GENERIC_INDEX, |
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}; |
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