wma afh chunk time fixes
authorAndre Noll <maan@systemlinux.org>
Sat, 10 Oct 2009 12:42:51 +0000 (14:42 +0200)
committerAndre Noll <maan@systemlinux.org>
Wed, 18 Nov 2009 18:34:12 +0000 (19:34 +0100)
error.h
wma_afh.c

diff --git a/error.h b/error.h
index 33d09f2..a99512f 100644 (file)
--- a/error.h
+++ b/error.h
@@ -34,10 +34,13 @@ DEFINE_ERRLIST_OBJECT_ENUM;
 #define SERVER_COMMAND_LIST_ERRORS
 #define AFS_COMMAND_LIST_ERRORS
 #define AUDIOD_COMMAND_LIST_ERRORS
-#define WMA_AFH_ERRORS
 
 extern const char **para_errlist[];
 
+#define WMA_AFH_ERRORS \
+       PARA_ERROR(NO_WMA, "asf/wma format not recognized"), \
+
+
 #define WMA_COMMON_ERRORS \
        PARA_ERROR(WMA_NO_GUID, "audio stream guid not found"), \
        PARA_ERROR(WMA_BAD_ASF_HEADER, "invalid asf header"), \
index 9e5f5c6..dc7994e 100644 (file)
--- a/wma_afh.c
+++ b/wma_afh.c
        _f + (_ba) + WMA_FRAME_SKIP < (_buf) + (_size); \
        _f += (_ba) + WMA_FRAME_SKIP)
 
+/*
+ * Must be called on a frame boundary, e.g. start + header_len.
+ * \return Frame count, superframe count via *num_superframes.
+ */
 static int count_frames(const char *buf, int buf_size, int block_align,
-       long unsigned *num_superframes)
+       int *num_superframes)
 {
-       int count = 0, step = block_align + WMA_FRAME_SKIP;
-       const uint8_t *p = (uint8_t *)buf + WMA_FRAME_SKIP;
+       int fc = 0, sfc = 0; /* frame count, superframe count */
+       const uint8_t *p;
 
 
-       if (buf_size <= WMA_FRAME_SKIP) {
-               if (num_superframes)
-                       *num_superframes = 0;
-               return 0;
-       }
-       count = 0;
-       step = block_align + WMA_FRAME_SKIP;
-       p = (uint8_t *)buf + WMA_FRAME_SKIP;
-
-       FOR_EACH_FRAME(p, (uint8_t *)buf, buf_size, block_align)
-               count += p[WMA_FRAME_SKIP] & 0x0f;
-       PARA_DEBUG_LOG("%d frames\n", count);
-       if (num_superframes) {
-               *num_superframes = buf_size / step;
-               PARA_DEBUG_LOG("%lu superframes\n", *num_superframes);
+       FOR_EACH_FRAME(p, (uint8_t *)buf, buf_size, block_align) {
+               fc += p[WMA_FRAME_SKIP] & 0x0f;
+               sfc++;
        }
-       return count;
+       PARA_INFO_LOG("%d frames, %d superframes\n", fc, sfc);
+       if (num_superframes)
+               *num_superframes = sfc;
+       return fc;
 }
 
 /*
@@ -185,31 +180,45 @@ static void read_asf_tags(const char *buf, int buf_size, struct taginfo *ti)
 
 }
 
+static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
+               struct timeval *result)
+{
+       uint64_t x = (uint64_t)num_frames * 1000 * 1000
+               / frequency / num_chunks;
+
+       result->tv_sec = x / 1000 / 1000;
+       result->tv_usec = x % (1000 * 1000);
+       PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
+               tv2ms(result));
+}
+
+/* Must be called on a frame boundary. */
 static int wma_make_chunk_table(char *buf, size_t buf_size, int block_align,
                struct afh_info *afhi)
 {
        const uint8_t *f, *start = (uint8_t *)buf;
        int i, j, frames_per_chunk, chunk_time;
        size_t ct_size = 250;
-       int count = 0, num_frames;
+       int ret, count = 0, num_frames, num_superframes;
 
        afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
        afhi->chunk_table[0] = 0;
        afhi->chunk_table[1] = afhi->header_len;
 
        num_frames = count_frames(buf, buf_size, block_align,
-               &afhi->chunks_total);
-       PARA_INFO_LOG("%d frames\n", num_frames);
+               &num_superframes);
+       ret = -E_NO_WMA;
+       if (num_frames == 0 || num_superframes == 0)
+               goto fail;
        afhi->seconds_total = num_frames * 2048 /* FIXME */
                / afhi->frequency;
-       frames_per_chunk = num_frames / afhi->chunks_total;
+       frames_per_chunk = num_frames / num_superframes;
+       PARA_INFO_LOG("%d frames per chunk\n", frames_per_chunk);
        i = 0;
        j = 1;
-       start += afhi->header_len;
-       buf_size -= afhi->header_len;
        FOR_EACH_FRAME(f, start, buf_size, block_align) {
                count += f[WMA_FRAME_SKIP] & 0x0f;
-               while (count > j * frames_per_chunk && f > start) {
+               while (count > j * frames_per_chunk) {
                        j++;
                        if (j >= ct_size) {
                                ct_size *= 2;
@@ -217,18 +226,15 @@ static int wma_make_chunk_table(char *buf, size_t buf_size, int block_align,
                                        afhi->chunk_table,
                                        ct_size * sizeof(uint32_t));
                        }
-                       PARA_DEBUG_LOG("ct[%d]: %zu\n", j, f - start);
-                       afhi->chunk_table[j] = f - start + afhi->header_len;
+                       afhi->chunk_table[j] = f - start + afhi->header_len + block_align + WMA_FRAME_SKIP;
                }
        }
        afhi->chunks_total = j;
-       chunk_time = num_frames * 1000 / afhi->frequency * 2048
-               / afhi->chunks_total;
-       PARA_INFO_LOG("ct: %d\n", chunk_time);
-       afhi->chunk_tv.tv_sec = chunk_time / 1000;
-       afhi->chunk_tv.tv_usec = (chunk_time % 1000) * 1000;
-       //set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
+       set_chunk_tv(num_frames * 2048, j + 10 /* FIXME */, afhi->frequency, &afhi->chunk_tv);
        return 1;
+fail:
+       free(afhi->chunk_table);
+       return ret;
 }
 
 static int wma_get_file_info(char *map, size_t numbytes, __a_unused int fd,
@@ -240,13 +246,18 @@ static int wma_get_file_info(char *map, size_t numbytes, __a_unused int fd,
        ret = read_asf_header(map, numbytes, &ahi);
        if (ret < 0)
                return ret;
+       if (ret == 0)
+               return -E_NO_WMA;
        afhi->bitrate = ahi.bit_rate / 1000;
+       if (ahi.sample_rate == 0)
+               return -E_NO_WMA;
        afhi->frequency = ahi.sample_rate;
        afhi->channels = ahi.channels;
        afhi->header_len = ahi.header_len;
        afhi->header_offset = 0;
+       wma_make_chunk_table(map + ahi.header_len, numbytes - ahi.header_len,
+               ahi.block_align, afhi);
        read_asf_tags(map, ahi.header_len, &afhi->tags);
-       wma_make_chunk_table(map, numbytes, ahi.block_align, afhi);
        return 0;
 }