mirror of https://github.com/FFmpeg/FFmpeg.git
foo86
8 years ago
committed by
Paul B Mahol
parent
930fe4b1f7
commit
f04ef26816
6 changed files with 211 additions and 1 deletions
@ -0,0 +1,206 @@ |
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/*
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* Copyright (C) 2017 foo86 |
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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 "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "spdif.h" |
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#define MARKER_16LE 0x72F81F4E |
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#define MARKER_20LE 0x20876FF0E154 |
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#define MARKER_24LE 0x72F8961F4EA5 |
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#define IS_16LE_MARKER(state) ((state & 0xFFFFFFFF) == MARKER_16LE) |
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#define IS_20LE_MARKER(state) ((state & 0xF0FFFFF0FFFF) == MARKER_20LE) |
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#define IS_24LE_MARKER(state) ((state & 0xFFFFFFFFFFFF) == MARKER_24LE) |
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#define IS_LE_MARKER(state) (IS_16LE_MARKER(state) || IS_20LE_MARKER(state) || IS_24LE_MARKER(state)) |
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static int s337m_get_offset_and_codec(AVFormatContext *s, |
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uint64_t state, |
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int data_type, int data_size, |
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int *offset, enum AVCodecID *codec) |
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{ |
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int word_bits; |
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if (IS_16LE_MARKER(state)) { |
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word_bits = 16; |
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} else if (IS_20LE_MARKER(state)) { |
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data_type >>= 8; |
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data_size >>= 4; |
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word_bits = 20; |
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} else { |
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data_type >>= 8; |
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word_bits = 24; |
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} |
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if ((data_type & 0x1F) != 0x1C) { |
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if (s) |
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avpriv_report_missing_feature(s, "Data type %#x in SMPTE 337M", data_type & 0x1F); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (codec) |
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*codec = AV_CODEC_ID_DOLBY_E; |
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switch (data_size / word_bits) { |
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case 3648: |
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*offset = 1920; |
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break; |
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case 3644: |
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*offset = 2002; |
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break; |
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case 3640: |
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*offset = 2000; |
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break; |
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case 3040: |
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*offset = 1601; |
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break; |
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default: |
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if (s) |
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avpriv_report_missing_feature(s, "Dolby E data size %d in SMPTE 337M", data_size); |
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return AVERROR_PATCHWELCOME; |
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} |
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*offset -= 4; |
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*offset *= (word_bits + 7 >> 3) * 2; |
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return 0; |
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} |
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static int s337m_probe(AVProbeData *p) |
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{ |
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uint64_t state = 0; |
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int markers[3] = { 0 }; |
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int i, sum, max, data_type, data_size, offset; |
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uint8_t *buf; |
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for (buf = p->buf; buf < p->buf + p->buf_size; buf++) { |
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state = (state << 8) | *buf; |
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if (!IS_LE_MARKER(state)) |
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continue; |
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if (IS_16LE_MARKER(state)) { |
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data_type = AV_RL16(buf + 1); |
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data_size = AV_RL16(buf + 3); |
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buf += 4; |
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} else { |
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data_type = AV_RL24(buf + 1); |
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data_size = AV_RL24(buf + 4); |
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buf += 6; |
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} |
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if (s337m_get_offset_and_codec(NULL, state, data_type, data_size, &offset, NULL)) |
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continue; |
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i = IS_16LE_MARKER(state) ? 0 : IS_20LE_MARKER(state) ? 1 : 2; |
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markers[i]++; |
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buf += offset; |
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state = 0; |
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} |
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sum = max = 0; |
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for (i = 0; i < FF_ARRAY_ELEMS(markers); i++) { |
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sum += markers[i]; |
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if (markers[max] < markers[i]) |
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max = i; |
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} |
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if (markers[max] > 3 && markers[max] * 4 > sum * 3) |
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return AVPROBE_SCORE_EXTENSION + 1; |
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return 0; |
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} |
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static int s337m_read_header(AVFormatContext *s) |
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{ |
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s->ctx_flags |= AVFMTCTX_NOHEADER; |
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return 0; |
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} |
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static void bswap_buf24(uint8_t *data, int size) |
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{ |
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int i; |
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for (i = 0; i < size / 3; i++, data += 3) |
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FFSWAP(uint8_t, data[0], data[2]); |
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} |
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static int s337m_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVIOContext *pb = s->pb; |
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uint64_t state = 0; |
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int ret, data_type, data_size, offset; |
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enum AVCodecID codec; |
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int64_t pos; |
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while (!IS_LE_MARKER(state)) { |
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state = (state << 8) | avio_r8(pb); |
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if (avio_feof(pb)) |
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return AVERROR_EOF; |
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} |
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if (IS_16LE_MARKER(state)) { |
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data_type = avio_rl16(pb); |
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data_size = avio_rl16(pb); |
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} else { |
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data_type = avio_rl24(pb); |
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data_size = avio_rl24(pb); |
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} |
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pos = avio_tell(pb); |
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if ((ret = s337m_get_offset_and_codec(s, state, data_type, data_size, &offset, &codec)) < 0) |
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return ret; |
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if ((ret = av_new_packet(pkt, offset)) < 0) |
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return ret; |
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pkt->pos = pos; |
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if (avio_read(pb, pkt->data, pkt->size) < pkt->size) { |
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av_packet_unref(pkt); |
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return AVERROR_EOF; |
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} |
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if (IS_16LE_MARKER(state)) |
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ff_spdif_bswap_buf16((uint16_t *)pkt->data, (uint16_t *)pkt->data, pkt->size >> 1); |
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else |
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bswap_buf24(pkt->data, pkt->size); |
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if (!s->nb_streams) { |
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AVStream *st = avformat_new_stream(s, NULL); |
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if (!st) { |
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av_packet_unref(pkt); |
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return AVERROR(ENOMEM); |
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} |
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->codec_id = codec; |
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} |
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return 0; |
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} |
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AVInputFormat ff_s337m_demuxer = { |
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.name = "s337m", |
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.long_name = NULL_IF_CONFIG_SMALL("SMPTE 337M"), |
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.read_probe = s337m_probe, |
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.read_header = s337m_read_header, |
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.read_packet = s337m_read_packet, |
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.flags = AVFMT_GENERIC_INDEX, |
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}; |
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