From 605f89ffc9dfd278d241d0425e9a8d93d535bbdd Mon Sep 17 00:00:00 2001 From: Laurent Aimar Date: Mon, 12 Sep 2011 21:09:57 +0200 Subject: [PATCH] segafilm: Fix potential division by 0 on corrupted segafilm streams in the demuxer. Signed-off-by: Michael Niedermayer --- libavformat/segafilm.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/libavformat/segafilm.c b/libavformat/segafilm.c index e712ebfbb1..a9b9667d14 100644 --- a/libavformat/segafilm.c +++ b/libavformat/segafilm.c @@ -111,11 +111,16 @@ static int film_read_header(AVFormatContext *s, film->audio_samplerate = AV_RB16(&scratch[24]); film->audio_channels = scratch[21]; film->audio_bits = scratch[22]; - if (film->audio_bits == 8) - film->audio_type = CODEC_ID_PCM_S8; - else if (film->audio_bits == 16) - film->audio_type = CODEC_ID_PCM_S16BE; - else + if (scratch[23] == 2) + film->audio_type = CODEC_ID_ADPCM_ADX; + else if (film->audio_channels > 0) { + if (film->audio_bits == 8) + film->audio_type = CODEC_ID_PCM_S8; + else if (film->audio_bits == 16) + film->audio_type = CODEC_ID_PCM_S16BE; + else + film->audio_type = CODEC_ID_NONE; + } else film->audio_type = CODEC_ID_NONE; } @@ -189,8 +194,12 @@ static int film_read_header(AVFormatContext *s, film->sample_table[i].pts *= film->base_clock; film->sample_table[i].pts /= film->audio_samplerate; - audio_frame_counter += (film->sample_table[i].sample_size / - (film->audio_channels * film->audio_bits / 8)); + if (film->audio_type == CODEC_ID_ADPCM_ADX) + audio_frame_counter += (film->sample_table[i].sample_size * 32 / + (18 * film->audio_channels)); + else if (film->audio_type != CODEC_ID_NONE) + audio_frame_counter += (film->sample_table[i].sample_size / + (film->audio_channels * film->audio_bits / 8)); } else { film->sample_table[i].stream = film->video_stream_index; film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;